Public bug reported: I'm pretty sure this wasn't happening a couple months ago, so this seems to be a recently introduced.
Steps to Reproduce: 1. Visit https://mmistakes.github.io/hpstr-jekyll-theme/ 2. Click 3-lined Menu icon. 3. Click 'About'. 4. Right-click the author image and open the inspector. 6. Visit https://pages.cpsc.ucalgary.ca/~cgbloor/w16/cpsc355/ in new tab. 7. Click 3-lined Menu icon. 8. Click 'TA Info'. 9. Right-click the author image and open the inspector. 10. Note that the layout changes in both tabs. 11. Pull one tab out so it becomes a new window. 12. Note that the layout is fixed in the new window. The wrapper around the button and menu is 'position:fixed', the menu box is 'position:absolute', and the contents are 'position:relative'. It looks like the layout breaking may be caused by the position relative things moving to (0,0). I'm not particularly great with CSS (hence why I'm using somebody's theme), but I'm reporting this as a bug because it seems wrong that actions in one tab can affect layout in another. Chrome on Windows 8.1 and Safari on OSX 10.11 seem to display both pages fine, though I only briefly tried them. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: firefox 46.0.1+build1-0ubuntu0.14.04.3 ProcVersionSignature: Ubuntu 4.2.0-36.42~14.04.1-generic 4.2.8-ckt8 Uname: Linux 4.2.0-36-generic x86_64 NonfreeKernelModules: wl AddonCompatCheckDisabled: False ApportVersion: 2.14.1-0ubuntu3.21 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: slavik 2180 F.... pulseaudio /dev/snd/controlC1: slavik 2180 F.... pulseaudio BuildID: 20160511224433 Channel: Unavailable CurrentDesktop: Unity Date: Mon Jun 6 19:10:03 2016 ExecutablePath: /usr/lib/firefox/firefox Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2014-04-21 (777 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) IpRoute: default via 192.168.20.1 dev eth0 proto static 10.0.3.0/24 dev lxcbr0 proto kernel scope link src 10.0.3.1 10.13.8.0/24 dev wlan0 proto kernel scope link src 10.13.8.66 metric 9 192.168.20.0/22 dev eth0 proto kernel scope link src 192.168.20.111 metric 1 Locales: extensions.sqlite corrupt or missing MostRecentCrashID: bp-7aaba62b-81c3-437a-b111-59dc22160205 PrefSources: prefs.js Profiles: Profile0 (Default) - LastVersion=46.0.1/20160511224433 (In use) RelatedPackageVersions: totem-mozilla 3.10.1-1ubuntu4 rhythmbox-mozilla 3.0.2-0ubuntu2 RunningIncompatibleAddons: False SourcePackage: firefox SubmittedCrashIDs: bp-7aaba62b-81c3-437a-b111-59dc22160205 bp-17ae02b8-78c6-4da3-b091-876da2150514 bp-ac3c4450-8d63-45a3-841d-fe8022141031 bp-b0ca0d48-0f22-482d-a1b9-0c0762141031 bp-0b927d1c-e829-463e-bf4a-d68692141031 Themes: extensions.sqlite corrupt or missing UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/22/2016 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP112.88Z.0138.B17.1602221600 dmi.board.asset.tag: Base Board Asset Tag# dmi.board.name: Mac-3CBD00234E554E41 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro11,2 dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-3CBD00234E554E41 dmi.modalias: dmi:bvnAppleInc.:bvrMBP112.88Z.0138.B17.1602221600:bd02/22/2016:svnAppleInc.:pnMacBookPro11,2:pvr1.0:rvnAppleInc.:rnMac-3CBD00234E554E41:rvrMacBookPro11,2:cvnAppleInc.:ct10:cvrMac-3CBD00234E554E41: dmi.product.name: MacBookPro11,2 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. ** Affects: firefox (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug third-party-packages trusty ** Attachment added: "screenshot of broken layout" https://bugs.launchpad.net/bugs/1589753/+attachment/4678495/+files/broken.png -- 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/1589753 Title: Layout breaks after doing things in other tabs Status in firefox package in Ubuntu: New Bug description: I'm pretty sure this wasn't happening a couple months ago, so this seems to be a recently introduced. Steps to Reproduce: 1. Visit https://mmistakes.github.io/hpstr-jekyll-theme/ 2. Click 3-lined Menu icon. 3. Click 'About'. 4. Right-click the author image and open the inspector. 6. Visit https://pages.cpsc.ucalgary.ca/~cgbloor/w16/cpsc355/ in new tab. 7. Click 3-lined Menu icon. 8. Click 'TA Info'. 9. Right-click the author image and open the inspector. 10. Note that the layout changes in both tabs. 11. Pull one tab out so it becomes a new window. 12. Note that the layout is fixed in the new window. The wrapper around the button and menu is 'position:fixed', the menu box is 'position:absolute', and the contents are 'position:relative'. It looks like the layout breaking may be caused by the position relative things moving to (0,0). I'm not particularly great with CSS (hence why I'm using somebody's theme), but I'm reporting this as a bug because it seems wrong that actions in one tab can affect layout in another. Chrome on Windows 8.1 and Safari on OSX 10.11 seem to display both pages fine, though I only briefly tried them. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: firefox 46.0.1+build1-0ubuntu0.14.04.3 ProcVersionSignature: Ubuntu 4.2.0-36.42~14.04.1-generic 4.2.8-ckt8 Uname: Linux 4.2.0-36-generic x86_64 NonfreeKernelModules: wl AddonCompatCheckDisabled: False ApportVersion: 2.14.1-0ubuntu3.21 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: slavik 2180 F.... pulseaudio /dev/snd/controlC1: slavik 2180 F.... pulseaudio BuildID: 20160511224433 Channel: Unavailable CurrentDesktop: Unity Date: Mon Jun 6 19:10:03 2016 ExecutablePath: /usr/lib/firefox/firefox Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2014-04-21 (777 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) IpRoute: default via 192.168.20.1 dev eth0 proto static 10.0.3.0/24 dev lxcbr0 proto kernel scope link src 10.0.3.1 10.13.8.0/24 dev wlan0 proto kernel scope link src 10.13.8.66 metric 9 192.168.20.0/22 dev eth0 proto kernel scope link src 192.168.20.111 metric 1 Locales: extensions.sqlite corrupt or missing MostRecentCrashID: bp-7aaba62b-81c3-437a-b111-59dc22160205 PrefSources: prefs.js Profiles: Profile0 (Default) - LastVersion=46.0.1/20160511224433 (In use) RelatedPackageVersions: totem-mozilla 3.10.1-1ubuntu4 rhythmbox-mozilla 3.0.2-0ubuntu2 RunningIncompatibleAddons: False SourcePackage: firefox SubmittedCrashIDs: bp-7aaba62b-81c3-437a-b111-59dc22160205 bp-17ae02b8-78c6-4da3-b091-876da2150514 bp-ac3c4450-8d63-45a3-841d-fe8022141031 bp-b0ca0d48-0f22-482d-a1b9-0c0762141031 bp-0b927d1c-e829-463e-bf4a-d68692141031 Themes: extensions.sqlite corrupt or missing UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/22/2016 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP112.88Z.0138.B17.1602221600 dmi.board.asset.tag: Base Board Asset Tag# dmi.board.name: Mac-3CBD00234E554E41 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro11,2 dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-3CBD00234E554E41 dmi.modalias: dmi:bvnAppleInc.:bvrMBP112.88Z.0138.B17.1602221600:bd02/22/2016:svnAppleInc.:pnMacBookPro11,2:pvr1.0:rvnAppleInc.:rnMac-3CBD00234E554E41:rvrMacBookPro11,2:cvnAppleInc.:ct10:cvrMac-3CBD00234E554E41: dmi.product.name: MacBookPro11,2 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. 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