The issue persists in Firefox 118.0.2 (64-bit).

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https://bugs.launchpad.net/bugs/2033988

Title:
  Firefox Snap update breaks dark themes

Status in firefox package in Ubuntu:
  New

Bug description:
  * Operating System: Kubuntu 22.04
  * KDE Plasma Version: 5.24.7
  * KDE Frameworks Version: 5.92.0
  * Qt Version: 5.15.3

  I would expect to be able to have full access to my bookmarks and the
  contents of the application menu regardless of the theme I am using.

  That was the case until I allowed the Firefox Snap to update. I closed
  Firefox to allow it to update itself when I got the Snap notification
  in the bottom right corner. I then ended up with this version:

  Firefox 117.0 (64-bit)
  Mozilla Firefox Snap for Ubuntu
  canonical-002 - 1.0

  The current version breaks my dark theme so that I cannot see my
  bookmarks or settings. The bookmark icons are visible, but the text is
  invisible on the dark background. Hovering over the bookmarks displays
  their tooltips and the bookmarks can be successfully clicked to open
  their pages. The application menu (that you get to by clicking the
  hamburger icon in the top right corner of Firefox) has no tooltips.
  You can still click on its entries, but you'd have to know which one
  you're clicking somehow or you're taking your chances.

  This appears to be a theme issue. I was using a dark (magenta) theme
  when the update occurred. When I switch to a light (pastel) theme, the
  entries in the application menu are visible and the text inside of
  toolbar bookmark folders is visible. However, text is still *not*
  visible in the bookmark manager. Interestingly, the bookmark manager
  is not honoring my current light (pastel) theme even after a restart
  of Firefox. Instead, the bookmark manager is still displaying with my
  dark (magenta) theme. This means that thorough searches of the
  bookmarks and manipulation of the bookmark contents is not currently
  possible.

  Some additional notes:

  * I tried replicating the issue in a virtual machine and wasn't able
  to, so I suspect something went wrong with the update on this machine.

  * I tried several dark and light themes and all of them exhibited the
  behavior described above.

  * Closing Firefox,  deleting everything in the
  ~/snap/firefox/common/.cache/ directory, and reopening Firefox has no
  effect on the issue.

  * Revision 3068 is the currently-broken revision I'm using and
  revision 3026 was my last-known-good revision, so something broke in
  or during the update to revision 3026.

  * Reverting to the previous revision with the sudo snap revert
  --revision=3026 firefox command does not affect the issue.

  * The issue does not exist If I log in to Kubuntu as a different user,
  even when switching between light and dark Firefox themes.

  I've attached the output of the snap list --all command and also these
  five screenshots to show that toolbar bookmark text is only visible
  when using a light theme, that bookmark manager text is never visible,
  that the current theme is not honored in the bookmark manager, and
  that the application menu text is only visible when using a light
  theme.

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