Basically, whenever I edit firefox-profile-path/chrome/userChrome.css, I want firefox to automatically apply the file again. The only posts I found on this are old and not straightforward. I’m wondering what currently works.
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I’ve found that the easiest way to live debug userChrome.css is to:
- Open the browser toolbox,
- Go to the style editor tab,
- Write userChrome in the search box to find it,
- Write CSS directly into the browser toolbox integrated editor.
The integrated editor reloads CSS changes as you write, even without saving.

