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Firefox 151 transparent popups #33

Description

@f-o

Describe the bug
Firefox 151 has renamed --arrowpanel variables to --panel. This breaks the CSS in popups.
Ref: https://bugzilla.mozilla.org/show_bug.cgi?id=2019097

To Reproduce
Right-click any page.
The popup menu has a transparent background.

Expected behavior
The background should be filled in with a solid colour.

Screenshots
Image

Desktop (please complete the following information):

  • OS: N/A
  • Browser: Firefox
  • Version: 151

Additional context
The new variable name is --panel instead of --arrowpanel.
I believe the solution is simply to rename the variables in popup.css.

Many Firefox theme maintainers have already implemented this fix, but I'm not sure if this fork is still being maintained.
I would shoot a pull request myself, but I'm not familiar with the codebase, and as there are ~60 occurrences of the arrowpanel name, I'm not sure how many of them needs to be changed.
Simply editing popup.css seems to fix the transparent background at least.

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