#StackBounty: #20.04 #firefox #themes System-wide tweak of Adwaita theme to highlight the active tab in Firefox?

Bounty: 50

I’m running Firefox 81.0 on Ubuntu 20.04, and the default theme is Adwaita, where the active tab (#EAEBE9) is almost the same color as the inactive tabs(#E7E8E6):

Adwaita theme

However, when I switch to e.g. the Ambiance theme, there is a sharp contrast between the color of the active tab (#F4F3F2) and the color of the inactive tabs (#504F47):

Ambiance theme

My usual workaround has been to install a custom theme, such as Adwaita Mix. However, I’m looking for something system-wide that works on the default theme and doesn’t require changing the browser profile. Here’s my questions:

  1. How can I make a system-wide tweak to the Adwaita theme to show a contrast between the active tab and the inactive tab?

    In Firefox’s custom themes, these would be called toolbar and frame/frame_inactive, but I’m not sure what the GTK+ equivalent is. I peeked at /usr/share/themes/Adwaita/gtk-3.0/gtk.css and saw this:

     /* Adwaita is now part of GTK+ 3, this file is no longer used */

    but presumably the theme can still be modified somehow without recompiling libgtk-3-0, right?

  2. Is this an intentional design choice or is there a place I should file an issue to fix this?

    I didn’t see anything already filed in the Adwaita issue tracker or in the Firefox issue tracker.

Get this bounty!!!

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