You can uninstall most Firefox add-ons from the addons manager page in the web browser. All you need to do is type in about:addons in the address bar and tap on the enter key to open the page.
A click on remove next to an add-on uninstalls it from the browser. You may need to restart the browser afterwards depending on the add-on to complete the process, but the add-on has been removed completely from the web browser when Firefox restarts.
Some add-ons on the other hand do not show a remove option at all in the addons manager. Most of the add-ons that you cannot uninstall from within the browser are called global extensions.
They are installed from third party sources, for instance when you install or update security software or another application on your system. The Babylon Toolbar is an example extension as it is often attached to software installations.
The majority of extensions are installed in the extensions directory of the Firefox profile folder. I'd suggest you start there to see if the extension that you want to remove from Firefox is listed there.
One of the easier ways to find out where it is located is to type about:support in the browser's address bar and hit enter. The page that opens lists an option to open the profile folder under "application basics" near the top.
You may run into two issues when you look at the list of installed browser add-ons. First, that extensions sometimes install with cryptic names so that it may be difficult to identify them, and second, that you may not find the extension that you want to uninstall listed here.
The easiest way to identify add-ons here is to load them into archiving software like 7-zip. Double-click on the install.rdf afterwards and look for name there.
Some extensions are already unpacked in a folder. Just open the folder of the extension in that case and double-click on the install.rdf file in there to identify its name.
It is however likely that you do not see the extension that you cannot remove in the directory.
Global extensions can be installed into any directory. The most likely folder is the extensions folder in the Firefox installation folder. This is usually C:\Program Files (x86)\Mozilla Firefox\extensions for 64-bit Windows operating systems, and C:\Program Files\Mozilla Firefox\extensions for 32-bit systems. Keep in mind though that you can install Firefox into any directory. Portable Firefox users need to open the extensions folder under the portable path.
Repeat the steps outlined above to identify all extensions listed here.
The third and final option is the Windows Registry. You may find extension information under the following two Registry keys:
Use the shortcut Windows-r to bring up the run box. Enter regedit in there and hit enter. Navigate to the keys in the Windows Registry and check if extensions are listed there.
Information that you will find there include the extension path.
Backup the Registry key first by selecting File > Export. Open Windows Explorer and navigate to the directory of the extension. Backup that directory as well, before you delete both the directory and the Registry key that links to it. Repeat the step for all extensions that you want to delete.
Please note that you need to close Firefox before you start deleting extensions on the system this way.
If you follow the method, you should be able to delete any extension that you cannot uninstall from within the browser interface.
To sum all that has been said up:
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