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Remove add-ons

  • 5 uphendule
  • 2 zinale nkinga
  • 917 views
  • Igcine ukuphendulwa ngu henricharles

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I want to remove AVAST, an add-on. For all other versions of Firefox all add-ons were listed under 'extensions'. But now in the latest one, even though I have many add-ons on my toolbar there are none listed under my 'extensions' and the one I want to remove is not under 'plug-ins'. I tried removing it from my toolbar, but that did not remove the add-on. How do I remove an add-on when that add-on is not listed anywhere.

Isisombululo esikhethiwe

Extensions that do not have a "Remove" button are installed by other software and are not under control of the Firefox extension manager. Such globally installed extensions are usually found via a registry scan or are installed in a location that Firefox scans for installed extensions.

Extensions installed this way need to be removed via the settings (options/preferences) of the program that has added this extension or this program has to be uninstalled via "Control Panel > Programs". In Firefox you an only disable such an extension.


It is possible that there is a problem with files in the profile folder that store the extensions registry.

Delete the extensions.* files (e.g. extensions.json, extensions.ini, extensions.sqlite) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

New files will be created when required.

See "Corrupt extension files":

If you see disabled or not compatible extensions in "Firefox menu button/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.

If this didn't help then delete addons.json and possibly prefs.js in case there is a problem with preferences.

You can use this button to go to the current Firefox profile folder:

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All Replies (5)

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Isisombululo Esikhethiwe

Extensions that do not have a "Remove" button are installed by other software and are not under control of the Firefox extension manager. Such globally installed extensions are usually found via a registry scan or are installed in a location that Firefox scans for installed extensions.

Extensions installed this way need to be removed via the settings (options/preferences) of the program that has added this extension or this program has to be uninstalled via "Control Panel > Programs". In Firefox you an only disable such an extension.


It is possible that there is a problem with files in the profile folder that store the extensions registry.

Delete the extensions.* files (e.g. extensions.json, extensions.ini, extensions.sqlite) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

New files will be created when required.

See "Corrupt extension files":

If you see disabled or not compatible extensions in "Firefox menu button/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.

If this didn't help then delete addons.json and possibly prefs.js in case there is a problem with preferences.

You can use this button to go to the current Firefox profile folder:

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It's not that the extensions don't have a 'remove' button, it's that the Extensions tab isn't listing the extensions. In previous versions of Firefox all the add-ons that I would get from 'get add-ons', when installed, would be listed in the Extensions tab. That's where I would see an enable/disable button and an uninstall button. I've got add-ons like AVAST DuckDuckGo, Adblock Plus, No Squint, LastPass and several others.

So now, when I open the menu on the top right side of the toolbar, I click on the Add-ons option and a menu of tabs comes up: Get Add-ons (which takes me to the add-ons page), Extensions (which says 'you don't have add-ons of this type installed'), Appearance (which has 4 personas I've used), Plugins (which has 7 plugins listed including Acrobat and Google Talk), and Services (which tells me the same thing that I read on Extensions, 'you don't have add-ons of this type installed').

The Extensions tab should have my AVAST, DuckDuckGo, AdBlock Plus and others which I got via 'Get Add-ons' listed with their uninstall button options. But as I've said in the above paragraph, there is only a message saying that I do not have these type of add-ons installed. Except that I do have them installed and they work. So if they are somewhere other than the Extensions tab on this latest version of Firefox, where are they?

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Did you try the second part of my above reply to check for issues with the extension registry files?

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Yes cor-el, it worked. I would never have figured that out on my own. Thank you.

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One can easily remove add-ons, plugins or extension from their web browsers. As you have asked to get rid of add-on and other extension from your Mozilla Firefox, then you can follow the guides and tutorial mentioned here - Remove Add-ons using Add-On Manager of Browsers