How to re-enable unsigned extensions in Firefox 50 without reinstalling them manually

The Problem

If you’ve recently upgraded Firefox you may be left with lots of unsigned extensions which need to be reinstalled. If you’ve followed our guide to allowing unsigned extensions in Firefox then you’re halfway there; but what if you don’t want to manually re-install every single one of your old or unsigned extensions, one-by-one?

Luckily, there is a way to automatically re-install all of them with very little effort.

The Solution

First of all, you should have already upgraded Firefox and enabled unsigned extensions. Now, to reinstall all your extensions in one go, do this:

1. Open your Firefox profile folder (%appdata%/Mozilla/Firefox/Profiles/[profile_id] or, from Firefox, navigate to about:support and click Show Folder). Ensure Firefox is closed.

2. Now open the extensions subfolder and temporarily move all of the files/folders to another location.

3. Open Firefox again; you should have no extensions now.

4. Close Firefox and move all those extension files/folders back to the extensions folder.

7. Re-open Firefox once more and you should see lots of new tabs asking you to install your old extensions. You can either click Install on each tab, or go to the Tools > Add-ons window and install/enable them all in bulk.