** Description changed:

  This issue is easy to reproduce by running live mode in Ubuntu MATE
  22.04, or even easier in Trisquel 11 (a distro based on Ubuntu 22.04
  with MATE installed) since the firefox snap package is not installed.
  
  #################################
  Firefox snap
  
  Disclaimer: This step is not needed in Trisquel (a distro based on
  Ubuntu + MATE).
  
  About Firefox snap package that comes with Ubuntu
  * In Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Firefox Web Browser".
  * In Ubuntu 22.04: In GNOME, it's visible in the menu. It also added to 
Favorites.
  
  Selected information about the entry
  /var/lib/snapd/desktop/applications/firefox_firefox.desktop
  
  Name=Firefox Web Browser
  Exec=env 
BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/firefox_firefox.desktop
 /snap/bin/firefox %u
  Icon=/snap/firefox/2356/default256.png
  
  ¤¤¤¤
  Remove firefox snap package
  
  [Disclaimer: snap is not the issue for this bug, because Trisquel (a
  GNU/Linux distribution based on Ubuntu) ships without snap, and Firefox
  is not added to the menu when I installed firefox (see the "Install
  firefox"). We only remove it below to make it possible to install the
  firefox ppa package.]
  
  Run these steps (from https://www.omgubuntu.co.uk/2022/04/how-to-
  install-firefox-deb-apt-ubuntu-22-04):
  
  sudo snap remove firefox
  
  echo '
  Package: *
  Pin: release o=LP-PPA-mozillateam
  Pin-Priority: 1001
  ' | sudo tee /etc/apt/preferences.d/mozilla-firefox
  
  echo 'Unattended-Upgrade::Allowed-Origins:: "LP-PPA-
  mozillateam:${distro_codename}";' | sudo tee
  /etc/apt/apt.conf.d/51unattended-upgrades-firefox
  
  For Ubuntu MATE: Reboot in order to remove the "Firefox Web Browser"
  from the Panel.
  
  Status:
  * Ubuntu MATE 22.04: "Firefox Web Browser" is removed from the Brisk Menu 
(actually the whole "Internet" category is removed from the Brisk Menu since 
"Firefox Web Browser" was the only item).
  * Ubuntu 22.04 (GNOME): "Firefox Web Browser" is removed from both the menu 
and from Favorites.
  
  ##############################
  Install firefox from the official PPA
  
  Run:
  sudo add-apt-repository ppa:mozillateam/ppa
  sudo apt update
  sudo apt install firefox
  
  Status:
  * Ubuntu: "Firefox Web Browser" is added to the menu.
  * Ubuntu MATE in the default Panel's Classic Menu: "Internet -> Firefox Web 
Browser" is NOT added (see attached screenshot). But if you copy the desktop 
icon, it will become visible right away in the Brisk Menu: cd 
/usr/share/applications/ && sudo cp firefox.desktop firefoxworking.desktop
  
  * /usr/share/applications/firefox.desktop is added. Selected information
  about the file:
  
  Name=Firefox Web Browser
  Exec=firefox %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  Actions=new-window;new-private-window;
  
  Examine the file:
  * desktop-file-validate /usr/share/applications/firefox.desktop # No errors
  
  ##############################
  Install firefox-esr from the official PPA
  
  This section has been added to examine why the firefox-esr package, but
- not the firefox package is adding an entry to "Menu -> Internet"
+ not the firefox package, is adding an entry to the Brisk Menu in Ubuntu
+ MATE.
  
  * Run: sudo apt install firefox-esr
  
  Status:
  * Ubuntu 22.04: "Firefox Web Browser"[1] is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> Firefox 
Web Browser"[1] is added. Information about the entry:
  
  * /usr/share/applications/firefox-esr.desktop is added. Selected
  information about the file:
  
  Name=Firefox Web Browser
  Exec=firefox-esr %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox-esr
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  StartupWMClass=firefox-esr-esr102
  Actions=new-window;new-private-window;
  
  desktop-file-validate /usr/share/applications/firefox-esr.desktop # No
  errors
  
  1: A minor issue not related to this bug that I filed at
  https://bugs.launchpad.net/ubuntu/+source/firefox-esr/+bug/2028439: The
  entry is correctly added, but "Name=Firefox Web Browser" in
  /usr/share/applications/firefox-esr.desktop should be changed to
  "Name=Firefox ESR Web Browser" (Debian stable firefox-esr package ships
  with "Name=Firefox ESR" in /usr/share/applications/firefox-esr.desktop).
  
  ##############################
  
  Install thunderbird from this PPA
  
- This section has been added to examine why "Menu -> Internet ->
- Thunderbird Mail" but not "Menu -> Internet -> Firefox Web Browser"
+ This section has been added to examine why the thunderbird package, but
+ not the firefox package, is adding an entry to the Brisk Menu in Ubuntu
+ MATE.
  
  * Run: sudo apt install thunderbird
  
  Status:
  * Ubuntu 22.04: "Internet -> Thunderbird Mail" is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Thunderbird Mail" is added.
  
  Information about the entry:
  * /usr/share/applications/thunderbird.desktop is added. Selected information 
about the file:
  
  Name=Thunderbird Mail
  Exec=thunderbird %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=thunderbird
  Categories=Application;Network;Email;
  
MimeType=x-scheme-handler/mailto;application/x-xpinstall;x-scheme-handler/webcal;x-scheme-handler/mid;message/rfc822;
  StartupNotify=true
  Actions=Compose;Contacts
  
  desktop-file-validate /usr/share/applications/thunderbird.desktop # No
  errors
  
  ##############################
  Temporary solution to add "Firefox Web Browser" to the Brisk Menu in Ubuntu 
MATE 22.04:
  
  * sudo cp firefox.desktop firefoxworking.desktop
  
  or
  
  * cp /usr/share/applications/firefox.desktop
  ~/.local/share/applications/

** Summary changed:

- firefox: firefox.desktop not visible in MATE's Brisk Menu
+ firefox: "Firefox Web Browser" visible in GNOME, but not in MATE

** Description changed:

- This issue is easy to reproduce by running live mode in Ubuntu MATE
- 22.04, or even easier in Trisquel 11 (a distro based on Ubuntu 22.04
- with MATE installed) since the firefox snap package is not installed.
+ This issue is easy to reproduce by running live mode in:
+ * Ubuntu MATE 22.04
+ * or even easier in Trisquel 11 (a distro based on Ubuntu 22.04 with MATE 
installed) since the firefox snap package is not installed.
  
  #################################
  Firefox snap
  
  Disclaimer: This step is not needed in Trisquel (a distro based on
  Ubuntu + MATE).
  
  About Firefox snap package that comes with Ubuntu
  * In Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Firefox Web Browser".
  * In Ubuntu 22.04: In GNOME, it's visible in the menu. It also added to 
Favorites.
  
  Selected information about the entry
  /var/lib/snapd/desktop/applications/firefox_firefox.desktop
  
  Name=Firefox Web Browser
  Exec=env 
BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/firefox_firefox.desktop
 /snap/bin/firefox %u
  Icon=/snap/firefox/2356/default256.png
  
  ¤¤¤¤
  Remove firefox snap package
  
  [Disclaimer: snap is not the issue for this bug, because Trisquel (a
  GNU/Linux distribution based on Ubuntu) ships without snap, and Firefox
  is not added to the menu when I installed firefox (see the "Install
  firefox"). We only remove it below to make it possible to install the
  firefox ppa package.]
  
  Run these steps (from https://www.omgubuntu.co.uk/2022/04/how-to-
  install-firefox-deb-apt-ubuntu-22-04):
  
  sudo snap remove firefox
  
  echo '
  Package: *
  Pin: release o=LP-PPA-mozillateam
  Pin-Priority: 1001
  ' | sudo tee /etc/apt/preferences.d/mozilla-firefox
  
  echo 'Unattended-Upgrade::Allowed-Origins:: "LP-PPA-
  mozillateam:${distro_codename}";' | sudo tee
  /etc/apt/apt.conf.d/51unattended-upgrades-firefox
  
  For Ubuntu MATE: Reboot in order to remove the "Firefox Web Browser"
  from the Panel.
  
  Status:
  * Ubuntu MATE 22.04: "Firefox Web Browser" is removed from the Brisk Menu 
(actually the whole "Internet" category is removed from the Brisk Menu since 
"Firefox Web Browser" was the only item).
  * Ubuntu 22.04 (GNOME): "Firefox Web Browser" is removed from both the menu 
and from Favorites.
  
  ##############################
  Install firefox from the official PPA
  
  Run:
  sudo add-apt-repository ppa:mozillateam/ppa
  sudo apt update
  sudo apt install firefox
  
  Status:
  * Ubuntu: "Firefox Web Browser" is added to the menu.
  * Ubuntu MATE in the default Panel's Classic Menu: "Internet -> Firefox Web 
Browser" is NOT added (see attached screenshot). But if you copy the desktop 
icon, it will become visible right away in the Brisk Menu: cd 
/usr/share/applications/ && sudo cp firefox.desktop firefoxworking.desktop
  
  * /usr/share/applications/firefox.desktop is added. Selected information
  about the file:
  
  Name=Firefox Web Browser
  Exec=firefox %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  Actions=new-window;new-private-window;
  
  Examine the file:
  * desktop-file-validate /usr/share/applications/firefox.desktop # No errors
  
  ##############################
  Install firefox-esr from the official PPA
  
  This section has been added to examine why the firefox-esr package, but
  not the firefox package, is adding an entry to the Brisk Menu in Ubuntu
  MATE.
  
  * Run: sudo apt install firefox-esr
  
  Status:
  * Ubuntu 22.04: "Firefox Web Browser"[1] is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> Firefox 
Web Browser"[1] is added. Information about the entry:
  
  * /usr/share/applications/firefox-esr.desktop is added. Selected
  information about the file:
  
  Name=Firefox Web Browser
  Exec=firefox-esr %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox-esr
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  StartupWMClass=firefox-esr-esr102
  Actions=new-window;new-private-window;
  
  desktop-file-validate /usr/share/applications/firefox-esr.desktop # No
  errors
  
  1: A minor issue not related to this bug that I filed at
  https://bugs.launchpad.net/ubuntu/+source/firefox-esr/+bug/2028439: The
  entry is correctly added, but "Name=Firefox Web Browser" in
  /usr/share/applications/firefox-esr.desktop should be changed to
  "Name=Firefox ESR Web Browser" (Debian stable firefox-esr package ships
  with "Name=Firefox ESR" in /usr/share/applications/firefox-esr.desktop).
  
  ##############################
  
  Install thunderbird from this PPA
  
  This section has been added to examine why the thunderbird package, but
  not the firefox package, is adding an entry to the Brisk Menu in Ubuntu
  MATE.
  
  * Run: sudo apt install thunderbird
  
  Status:
  * Ubuntu 22.04: "Internet -> Thunderbird Mail" is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Thunderbird Mail" is added.
  
  Information about the entry:
  * /usr/share/applications/thunderbird.desktop is added. Selected information 
about the file:
  
  Name=Thunderbird Mail
  Exec=thunderbird %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=thunderbird
  Categories=Application;Network;Email;
  
MimeType=x-scheme-handler/mailto;application/x-xpinstall;x-scheme-handler/webcal;x-scheme-handler/mid;message/rfc822;
  StartupNotify=true
  Actions=Compose;Contacts
  
  desktop-file-validate /usr/share/applications/thunderbird.desktop # No
  errors
  
  ##############################
  Temporary solution to add "Firefox Web Browser" to the Brisk Menu in Ubuntu 
MATE 22.04:
  
  * sudo cp firefox.desktop firefoxworking.desktop
  
  or
  
  * cp /usr/share/applications/firefox.desktop
  ~/.local/share/applications/

** Description changed:

  This issue is easy to reproduce by running live mode in:
  * Ubuntu MATE 22.04
  * or even easier in Trisquel 11 (a distro based on Ubuntu 22.04 with MATE 
installed) since the firefox snap package is not installed.
  
  #################################
  Firefox snap
  
  Disclaimer: This step is not needed in Trisquel (a distro based on
  Ubuntu + MATE).
  
  About Firefox snap package that comes with Ubuntu
  * In Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Firefox Web Browser".
  * In Ubuntu 22.04: In GNOME, it's visible in the menu. It also added to 
Favorites.
  
  Selected information about the entry
  /var/lib/snapd/desktop/applications/firefox_firefox.desktop
  
  Name=Firefox Web Browser
  Exec=env 
BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/firefox_firefox.desktop
 /snap/bin/firefox %u
  Icon=/snap/firefox/2356/default256.png
  
  ¤¤¤¤
  Remove firefox snap package
  
  [Disclaimer: snap is not the issue for this bug, because Trisquel (a
  GNU/Linux distribution based on Ubuntu) ships without snap, and Firefox
  is not added to the menu when I installed firefox (see the "Install
  firefox"). We only remove it below to make it possible to install the
  firefox ppa package.]
  
  Run these steps (from https://www.omgubuntu.co.uk/2022/04/how-to-
  install-firefox-deb-apt-ubuntu-22-04):
  
  sudo snap remove firefox
  
  echo '
  Package: *
  Pin: release o=LP-PPA-mozillateam
  Pin-Priority: 1001
  ' | sudo tee /etc/apt/preferences.d/mozilla-firefox
  
  echo 'Unattended-Upgrade::Allowed-Origins:: "LP-PPA-
  mozillateam:${distro_codename}";' | sudo tee
  /etc/apt/apt.conf.d/51unattended-upgrades-firefox
  
- For Ubuntu MATE: Reboot in order to remove the "Firefox Web Browser"
- from the Panel.
+ For Ubuntu MATE: Right click on the MATE Panel and click on "Reset all
+ Panels" to remove "Firefox Web Browser".
  
  Status:
  * Ubuntu MATE 22.04: "Firefox Web Browser" is removed from the Brisk Menu 
(actually the whole "Internet" category is removed from the Brisk Menu since 
"Firefox Web Browser" was the only item).
  * Ubuntu 22.04 (GNOME): "Firefox Web Browser" is removed from both the menu 
and from Favorites.
  
  ##############################
  Install firefox from the official PPA
  
  Run:
  sudo add-apt-repository ppa:mozillateam/ppa
  sudo apt update
  sudo apt install firefox
  
  Status:
  * Ubuntu: "Firefox Web Browser" is added to the menu.
  * Ubuntu MATE in the default Panel's Classic Menu: "Internet -> Firefox Web 
Browser" is NOT added (see attached screenshot). But if you copy the desktop 
icon, it will become visible right away in the Brisk Menu: cd 
/usr/share/applications/ && sudo cp firefox.desktop firefoxworking.desktop
  
  * /usr/share/applications/firefox.desktop is added. Selected information
  about the file:
  
  Name=Firefox Web Browser
  Exec=firefox %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  Actions=new-window;new-private-window;
  
  Examine the file:
  * desktop-file-validate /usr/share/applications/firefox.desktop # No errors
  
  ##############################
  Install firefox-esr from the official PPA
  
  This section has been added to examine why the firefox-esr package, but
  not the firefox package, is adding an entry to the Brisk Menu in Ubuntu
  MATE.
  
  * Run: sudo apt install firefox-esr
  
  Status:
  * Ubuntu 22.04: "Firefox Web Browser"[1] is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> Firefox 
Web Browser"[1] is added. Information about the entry:
  
  * /usr/share/applications/firefox-esr.desktop is added. Selected
  information about the file:
  
  Name=Firefox Web Browser
  Exec=firefox-esr %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox-esr
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  StartupWMClass=firefox-esr-esr102
  Actions=new-window;new-private-window;
  
  desktop-file-validate /usr/share/applications/firefox-esr.desktop # No
  errors
  
  1: A minor issue not related to this bug that I filed at
  https://bugs.launchpad.net/ubuntu/+source/firefox-esr/+bug/2028439: The
  entry is correctly added, but "Name=Firefox Web Browser" in
  /usr/share/applications/firefox-esr.desktop should be changed to
  "Name=Firefox ESR Web Browser" (Debian stable firefox-esr package ships
  with "Name=Firefox ESR" in /usr/share/applications/firefox-esr.desktop).
  
  ##############################
  
  Install thunderbird from this PPA
  
  This section has been added to examine why the thunderbird package, but
  not the firefox package, is adding an entry to the Brisk Menu in Ubuntu
  MATE.
  
  * Run: sudo apt install thunderbird
  
  Status:
  * Ubuntu 22.04: "Internet -> Thunderbird Mail" is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Thunderbird Mail" is added.
  
  Information about the entry:
  * /usr/share/applications/thunderbird.desktop is added. Selected information 
about the file:
  
  Name=Thunderbird Mail
  Exec=thunderbird %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=thunderbird
  Categories=Application;Network;Email;
  
MimeType=x-scheme-handler/mailto;application/x-xpinstall;x-scheme-handler/webcal;x-scheme-handler/mid;message/rfc822;
  StartupNotify=true
  Actions=Compose;Contacts
  
  desktop-file-validate /usr/share/applications/thunderbird.desktop # No
  errors
  
  ##############################
  Temporary solution to add "Firefox Web Browser" to the Brisk Menu in Ubuntu 
MATE 22.04:
  
  * sudo cp firefox.desktop firefoxworking.desktop
  
  or
  
  * cp /usr/share/applications/firefox.desktop
  ~/.local/share/applications/

** Description changed:

  This issue is easy to reproduce by running live mode in:
  * Ubuntu MATE 22.04
  * or even easier in Trisquel 11 (a distro based on Ubuntu 22.04 with MATE 
installed) since the firefox snap package is not installed.
  
  #################################
  Firefox snap
  
  Disclaimer: This step is not needed in Trisquel (a distro based on
  Ubuntu + MATE).
  
  About Firefox snap package that comes with Ubuntu
  * In Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Firefox Web Browser".
  * In Ubuntu 22.04: In GNOME, it's visible in the menu. It also added to 
Favorites.
  
  Selected information about the entry
  /var/lib/snapd/desktop/applications/firefox_firefox.desktop
  
  Name=Firefox Web Browser
  Exec=env 
BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/firefox_firefox.desktop
 /snap/bin/firefox %u
  Icon=/snap/firefox/2356/default256.png
  
  ¤¤¤¤
  Remove firefox snap package
  
  [Disclaimer: snap is not the issue for this bug, because Trisquel (a
  GNU/Linux distribution based on Ubuntu) ships without snap, and Firefox
  is not added to the menu when I installed firefox (see the "Install
  firefox"). We only remove it below to make it possible to install the
  firefox ppa package.]
  
  Run these steps (from https://www.omgubuntu.co.uk/2022/04/how-to-
  install-firefox-deb-apt-ubuntu-22-04):
  
  sudo snap remove firefox
  
  echo '
  Package: *
  Pin: release o=LP-PPA-mozillateam
  Pin-Priority: 1001
  ' | sudo tee /etc/apt/preferences.d/mozilla-firefox
  
  echo 'Unattended-Upgrade::Allowed-Origins:: "LP-PPA-
  mozillateam:${distro_codename}";' | sudo tee
  /etc/apt/apt.conf.d/51unattended-upgrades-firefox
  
- For Ubuntu MATE: Right click on the MATE Panel and click on "Reset all
- Panels" to remove "Firefox Web Browser".
+ For Ubuntu MATE: Right-click on the MATE Panel and click on "Reset all
+ Panels" to remove "Firefox Web Browser".[2]
  
  Status:
  * Ubuntu MATE 22.04: "Firefox Web Browser" is removed from the Brisk Menu 
(actually the whole "Internet" category is removed from the Brisk Menu since 
"Firefox Web Browser" was the only item).
  * Ubuntu 22.04 (GNOME): "Firefox Web Browser" is removed from both the menu 
and from Favorites.
  
  ##############################
  Install firefox from the official PPA
  
  Run:
  sudo add-apt-repository ppa:mozillateam/ppa
  sudo apt update
  sudo apt install firefox
  
  Status:
  * Ubuntu: "Firefox Web Browser" is added to the menu.
  * Ubuntu MATE in the default Panel's Classic Menu: "Internet -> Firefox Web 
Browser" is NOT added (see attached screenshot). But if you copy the desktop 
icon, it will become visible right away in the Brisk Menu: cd 
/usr/share/applications/ && sudo cp firefox.desktop firefoxworking.desktop
  
  * /usr/share/applications/firefox.desktop is added. Selected information
  about the file:
  
  Name=Firefox Web Browser
  Exec=firefox %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  Actions=new-window;new-private-window;
  
  Examine the file:
  * desktop-file-validate /usr/share/applications/firefox.desktop # No errors
  
  ##############################
  Install firefox-esr from the official PPA
  
  This section has been added to examine why the firefox-esr package, but
  not the firefox package, is adding an entry to the Brisk Menu in Ubuntu
  MATE.
  
  * Run: sudo apt install firefox-esr
  
  Status:
  * Ubuntu 22.04: "Firefox Web Browser"[1] is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> Firefox 
Web Browser"[1] is added. Information about the entry:
  
  * /usr/share/applications/firefox-esr.desktop is added. Selected
  information about the file:
  
  Name=Firefox Web Browser
  Exec=firefox-esr %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox-esr
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  StartupWMClass=firefox-esr-esr102
  Actions=new-window;new-private-window;
  
  desktop-file-validate /usr/share/applications/firefox-esr.desktop # No
  errors
  
- 1: A minor issue not related to this bug that I filed at
- https://bugs.launchpad.net/ubuntu/+source/firefox-esr/+bug/2028439: The
- entry is correctly added, but "Name=Firefox Web Browser" in
- /usr/share/applications/firefox-esr.desktop should be changed to
- "Name=Firefox ESR Web Browser" (Debian stable firefox-esr package ships
- with "Name=Firefox ESR" in /usr/share/applications/firefox-esr.desktop).
- 
  ##############################
  
  Install thunderbird from this PPA
  
  This section has been added to examine why the thunderbird package, but
  not the firefox package, is adding an entry to the Brisk Menu in Ubuntu
  MATE.
  
  * Run: sudo apt install thunderbird
  
  Status:
  * Ubuntu 22.04: "Internet -> Thunderbird Mail" is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Thunderbird Mail" is added.
  
  Information about the entry:
  * /usr/share/applications/thunderbird.desktop is added. Selected information 
about the file:
  
  Name=Thunderbird Mail
  Exec=thunderbird %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=thunderbird
  Categories=Application;Network;Email;
  
MimeType=x-scheme-handler/mailto;application/x-xpinstall;x-scheme-handler/webcal;x-scheme-handler/mid;message/rfc822;
  StartupNotify=true
  Actions=Compose;Contacts
  
  desktop-file-validate /usr/share/applications/thunderbird.desktop # No
  errors
  
  ##############################
  Temporary solution to add "Firefox Web Browser" to the Brisk Menu in Ubuntu 
MATE 22.04:
  
  * sudo cp firefox.desktop firefoxworking.desktop
  
  or
  
  * cp /usr/share/applications/firefox.desktop
  ~/.local/share/applications/
+ 
+ 
+ #############################
+ References
+ 
+ Issues not related to this bug report:
+ * 1: A minor issue not related to this bug that I filed at 
https://bugs.launchpad.net/ubuntu/+source/firefox-esr/+bug/2028439: The entry 
is correctly added, but "Name=Firefox Web Browser" in 
/usr/share/applications/firefox-esr.desktop should be changed to "Name=Firefox 
ESR Web Browser" (Debian stable firefox-esr package ships with "Name=Firefox 
ESR" in /usr/share/applications/firefox-esr.desktop).
+ * 2: https://bugs.launchpad.net/ubuntu/+bug/2028577

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/2027828

Title:
  firefox: "Firefox Web Browser" visible in GNOME, but not in MATE

Status in firefox package in Ubuntu:
  New

Bug description:
  This issue is easy to reproduce by running live mode in:
  * Ubuntu MATE 22.04
  * or even easier in Trisquel 11 (a distro based on Ubuntu 22.04 with MATE 
installed) since the firefox snap package is not installed.

  #################################
  Firefox snap

  Disclaimer: This step is not needed in Trisquel (a distro based on
  Ubuntu + MATE).

  About Firefox snap package that comes with Ubuntu
  * In Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Firefox Web Browser".
  * In Ubuntu 22.04: In GNOME, it's visible in the menu. It also added to 
Favorites.

  Selected information about the entry
  /var/lib/snapd/desktop/applications/firefox_firefox.desktop

  Name=Firefox Web Browser
  Exec=env 
BAMF_DESKTOP_FILE_HINT=/var/lib/snapd/desktop/applications/firefox_firefox.desktop
 /snap/bin/firefox %u
  Icon=/snap/firefox/2356/default256.png

  ¤¤¤¤
  Remove firefox snap package

  [Disclaimer: snap is not the issue for this bug, because Trisquel (a
  GNU/Linux distribution based on Ubuntu) ships without snap, and
  Firefox is not added to the menu when I installed firefox (see the
  "Install firefox"). We only remove it below to make it possible to
  install the firefox ppa package.]

  Run these steps (from https://www.omgubuntu.co.uk/2022/04/how-to-
  install-firefox-deb-apt-ubuntu-22-04):

  sudo snap remove firefox

  echo '
  Package: *
  Pin: release o=LP-PPA-mozillateam
  Pin-Priority: 1001
  ' | sudo tee /etc/apt/preferences.d/mozilla-firefox

  echo 'Unattended-Upgrade::Allowed-Origins:: "LP-PPA-
  mozillateam:${distro_codename}";' | sudo tee
  /etc/apt/apt.conf.d/51unattended-upgrades-firefox

  For Ubuntu MATE: Right-click on the MATE Panel and click on "Reset all
  Panels" to remove "Firefox Web Browser".[2]

  Status:
  * Ubuntu MATE 22.04: "Firefox Web Browser" is removed from the Brisk Menu 
(actually the whole "Internet" category is removed from the Brisk Menu since 
"Firefox Web Browser" was the only item).
  * Ubuntu 22.04 (GNOME): "Firefox Web Browser" is removed from both the menu 
and from Favorites.

  ##############################
  Install firefox from the official PPA

  Run:
  sudo add-apt-repository ppa:mozillateam/ppa
  sudo apt update
  sudo apt install firefox

  Status:
  * Ubuntu: "Firefox Web Browser" is added to the menu.
  * Ubuntu MATE in the default Panel's Classic Menu: "Internet -> Firefox Web 
Browser" is NOT added (see attached screenshot). But if you copy the desktop 
icon, it will become visible right away in the Brisk Menu: cd 
/usr/share/applications/ && sudo cp firefox.desktop firefoxworking.desktop

  * /usr/share/applications/firefox.desktop is added. Selected
  information about the file:

  Name=Firefox Web Browser
  Exec=firefox %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  Actions=new-window;new-private-window;

  Examine the file:
  * desktop-file-validate /usr/share/applications/firefox.desktop # No errors

  ##############################
  Install firefox-esr from the official PPA

  This section has been added to examine why the firefox-esr package,
  but not the firefox package, is adding an entry to the Brisk Menu in
  Ubuntu MATE.

  * Run: sudo apt install firefox-esr

  Status:
  * Ubuntu 22.04: "Firefox Web Browser"[1] is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> Firefox 
Web Browser"[1] is added. Information about the entry:

  * /usr/share/applications/firefox-esr.desktop is added. Selected
  information about the file:

  Name=Firefox Web Browser
  Exec=firefox-esr %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=firefox-esr
  Categories=GNOME;GTK;Network;WebBrowser;
  
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  StartupNotify=true
  StartupWMClass=firefox-esr-esr102
  Actions=new-window;new-private-window;

  desktop-file-validate /usr/share/applications/firefox-esr.desktop # No
  errors

  ##############################

  Install thunderbird from this PPA

  This section has been added to examine why the thunderbird package,
  but not the firefox package, is adding an entry to the Brisk Menu in
  Ubuntu MATE.

  * Run: sudo apt install thunderbird

  Status:
  * Ubuntu 22.04: "Internet -> Thunderbird Mail" is added to the menu
  * Ubuntu MATE 22.04: The default Panel's Classic Menu: "Internet -> 
Thunderbird Mail" is added.

  Information about the entry:
  * /usr/share/applications/thunderbird.desktop is added. Selected information 
about the file:

  Name=Thunderbird Mail
  Exec=thunderbird %u
  Terminal=false
  X-MultipleArgs=false
  Type=Application
  Icon=thunderbird
  Categories=Application;Network;Email;
  
MimeType=x-scheme-handler/mailto;application/x-xpinstall;x-scheme-handler/webcal;x-scheme-handler/mid;message/rfc822;
  StartupNotify=true
  Actions=Compose;Contacts

  desktop-file-validate /usr/share/applications/thunderbird.desktop # No
  errors

  ##############################
  Temporary solution to add "Firefox Web Browser" to the Brisk Menu in Ubuntu 
MATE 22.04:

  * sudo cp firefox.desktop firefoxworking.desktop

  or

  * cp /usr/share/applications/firefox.desktop
  ~/.local/share/applications/

  
  #############################
  References

  Issues not related to this bug report:
  * 1: A minor issue not related to this bug that I filed at 
https://bugs.launchpad.net/ubuntu/+source/firefox-esr/+bug/2028439: The entry 
is correctly added, but "Name=Firefox Web Browser" in 
/usr/share/applications/firefox-esr.desktop should be changed to "Name=Firefox 
ESR Web Browser" (Debian stable firefox-esr package ships with "Name=Firefox 
ESR" in /usr/share/applications/firefox-esr.desktop).
  * 2: https://bugs.launchpad.net/ubuntu/+bug/2028577

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