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userchrome.css changes not working in Firefox 78.2.0esr release

  • 1 reply
  • 1 has this problem
  • Last reply by cor-el

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Hi All -

I have been using Firefox for a while now. I have customizations using userchrome.css file. But after recent upgrade of my Firefox to Firefox 78.2.0esr few of the userchrome.css changes are not working. Especially changes to do with the URL dropdown box for customizing background color for bookmarks.

Attached is userchrome.css file from my side.

I already have legal style flag enabled from about:config. But still the issue happens.

Can somebody help me fix this issue?


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  1. PopupAutoCompleteRichResult is no longer used and has been replaced by #urlbar-results.

So you will have to look for replacement code or use the Browser Toolbox.

See also this subredit website:


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