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How to hide element using userChrome?
(lemmy.world)
A place to discuss the news and latest developments on the open-source browser Firefox
If you still want to learn it, these two articles are good:
The video in the second article is important. Near the end of the video, they show the Browser Toolbox. With that, you can select a UI element in Firefox's UI to find out what the element's ID is. You will need the ID for writing the rule.