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I have been experimenting with the about:config settings of Firefox 47.0 on my new Xenial installation. This unfortunately has left Firefox broken.

I have read how to search through about:config to reset all of my bad settings but I would prefer to completely reset to defaults.

How do I do this?

2 Answers 2

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First, you can try reseting the settings of firefox.
If it doesn't work, remove firefox completely using the command :

sudo apt-get purge firefox

Then try reinstalling it using the command:

sudo apt-get install firefox
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Firefox can be easily reset to defaults after injudicious alterations in about:config by following these steps:

  1. Close Firefox completely
  2. Open the folder ~/.mozilla/firefox/< Profile Name >/, the < Profile Name > folder will most usually be named something like this:

enter image description here

  1. Within that folder rename the file prefs.js to prefs.js_bak by right clicking on the file and selecting 'Rename...'. Again a screenshot to demonstrate the exact location:

enter image description here

  1. Reopen Firefox and resolve never to break it again :)

References:

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