[FluxApex]

I use Linux as well (several distros), but I haven't messed with it much lately and have been developing Windows utilities so it's been a while, but you may find good information here:

Ubuntu - Userchrome css tweaks for firefox quantum and later

It seams you might have to add:
@namespace xul url(https://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

to the top of your userChrome.css file

• This reply was modified 5 years, 6 months ago by FluxApex.

[FluxApex]

And for your reference the second

background: #<hex color>

will override the first

background: initial

and therefore the first becomes redundant and no longer needed.

[FluxApex]

It is not in the home directory, but in a sub directory named "Chrome" so the file would be located @

"%appdata%\Mozilla\Firefox\Profile.*******\Chrome\userChrome.css"

in your appropriate Profile directory. He did state in the OP that if the "Chrome" folder doesn't exist you must create it.

• This reply was modified 5 years, 7 months ago by FluxApex.
• This reply was modified 5 years, 7 months ago by FluxApex.

[FluxApex]

Thanks for this. Glad I can use Color Tabs and still theme FF. Instead of 'initial' I have just used contrasting colors for 'background' and 'color'. I'm not that big a fan of 'Metro' colors in the newer apps, but contrasting metro colors would work well here.
What I'm using atm:

toolbar {
  background: #263238 !important;
  color: #ECEFF1 !important;
}

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