CSS to prevent tab labels being grayed out when Floorp window is unfocused

[philipmgrant]

In Floorp 12.1.4 (Linux Flatpak), when the Floorp browser window has focus, the labels of the tabs are grayed out. (Screenshots show the difference between the window when focused and when unfocused.)

Native Firefox doesn't behave like this, so I think this is a new Floorp customisation.

I would like to get the native behavior back (i.e. tabs are grayed out only if they are sleeping, irrespective of whether the window has focus).

Can you tell me the CSS change that introduced the new behavior, so I can reverse it in my userChrome.css?

[philipmgrant]

Found it!

This CSS worked for me to fix it:

#browser #sidebar-main #vertical-tabs {
    opacity: 1 !important;
}

The rule that causes the graying out seems to be:

.browser-titlebar {
  :root[customtitlebar] &, :root[customtitlebar] & #urlbar:popover-open {
    &:-moz-window-inactive {
      opacity: var(--inactive-titlebar-opacity);
    }
  }
}

Actually, this seems to come from a Firefox file (browser-shared.css) so I'm not sure why Firefox doesn't behave the same!