Hellow, im trying to hide some element in firefox using userChrome. In perticular on left the the “View recent browsing accross windows and devices” how could i do that? Or what is a good resource to know how to learn this myself?
Thank for your time and have a nice day!
If you mean this button:
…you can just remove that by clicking the “Remove from Toolbar” in the right-click menu (as shown).
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.