The other day I was doing some routine maintenance on my system and while navigating inside my Firefox configuration (yes, the about:config command that you put in the URL field) I’ve found quite a few old keys related to addins that I’ve removed quite long ago.
The second method is good if you have to remove a big number of entries:
1. Close Firefox
2. Open the file “prefs.js” that is located under your Firefox profile at ~/.mozilla/firefox/xxxxxxxxx.default/ (where the x’s stand for a randomly generated code that will change for each profile) using your favourite editor.
4. Delete all the entries you want
5. Save the file and restart Firefox
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