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I created a userChrome.css file (including the aforementioned snippets + the namespace line on top) and put it into the folder that Firefox tells me is my profile folder - still see the tabs on top though (Mac OS Mojave - FF - Quantum) - any ideas what could be the issue? I did restart firefox.

It needs to go into the "chrome" subdirectory of your profile directory. Usually this doesn't exist so you'll have to create it yourself.

thanks that helped! the RYG buttons of Mac now overlap with back reload etc - but I guess I can tweak the CSS to make that fit.

Thanks again!

Use this CSS

  #nav-bar-customization-target {
     padding-left: 65px;

I had an issue with the coloration on top of that, so I elected to turn the regular system title bar back on. That perfected it for me.

how did you do that?

Right click on the navigation area and choose "Customize..." In the bottom left is a checkbox labeled "Title Bar"

I was having problems with most userChrome.css I found on FF Dev Edition on Mac OS.

Eventually found this repo with some pretty good ones: https://github.com/Timvde/UserChrome-Tweaks/tree/master/tabs

Here's what I've got: https://gist.github.com/tiagoad/c85f9752033b1d78d23c5bae7373...

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