Cannot uninstall an add-on
If an extension or theme cannot be uninstalled through the use of the Firefox Add-ons window (see Uninstalling add-ons), the following steps may be tried.
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- Uninstall from Safe Mode
- Uninstall using Windows Add/Remove Programs
- Uninstalling manually
- Globally installed extensions
- Extensions installed by other software
- Microsoft .NET Framework Assistant
- Java Quick Starter
Uninstall from Safe Mode
If you cannot access the Add-ons window or if the button is grayed out, you may need to uninstall the extension from Firefox Safe Mode.
- Close down Firefox completely: At the top of the Firefox window, click the File menu, and select the Exit menu item.Close down Firefox completely: On the menu bar, click the Firefox menu, and select the Quit Firefox menu item.Close down Firefox completely: At the top of the Firefox window, click the File menu, and select the Quit menu item.
- In Windows, click , open the All Programs list, and navigate to the Mozilla Firefox folder. In the Mozilla Firefox folder, select Mozilla Firefox (Safe Mode).Hold down the Option key, as you start Firefox.Go to your Terminal and run:
firefox -safe-mode
You may need to specify the Firefox installation path (e.g. /usr/lib/firefox-3.5). - Firefox should start up with a Firefox Safe Mode dialog.
Note: You can also start Firefox in Safe Mode by clicking , selecting Run (or use the Start Search box in Windows 7 and Vista) and then entering the following in the text field:"%PROGRAMFILES%\Mozilla Firefox\firefox.exe" -safe-mode
With Firefox in Safe Mode, you may find that you are able now to uninstall certain add-ons following the steps in Uninstalling add-ons.
Uninstall using Windows Add/Remove Programs
Some extensions use Windows installers and need to be uninstalled through the Windows Add or Remove Programs menu as described below:
- Exit Firefox. From the menu at the top of the Firefox window, select File and then select the Exit menu item.
- From the Start Menu in the Windows taskbar, select Control Panel. The Control Panel opens.
- Open the Windows program listing.
- (Windows Vista) Click Uninstall a program.
- (Windows 2000/XP) Double-click Add or Remove Programs.
- From the list of currently installed programs, select the extension you are trying to uninstall.
- To begin the uninstall:
- (Windows Vista) Click .
- (Windows 2000/XP) Click .
- Follow the on-screen instructions to remove the extension.
Uninstalling manually
If you are unable to uninstall even in safe mode, the following steps can be taken to uninstall an extension manually:
- From the menu at the top of the Firefox windowbar, select FileFirefox and then select the ExitQuit FirefoxQuit menu item.
- Open the Firefox profiles folder.
- For more information, see profile folder.
- If the Profiles folder contains multiple folders, open the folder for the active profile.
- Open the extensions folder inside your profile folder.
- Each folder here corresponds to an extension. Often the names of the folders are obscured. For each folder:
- Use a text editor (like NotepadGedit or KateTextEdit) to open the install.rdf file inside it.
- Using your text editor's Find tool, search for the following text:
em:name
- If the name on that line corresponds to an extension you wish to remove, delete the whole folder.
Globally installed extensions
In rare cases, extensions are installed globally, into the Firefox installation folder. To remove a globally installed extension follow these steps:
- From the menu at the top of the Firefox windowbar, select FileFirefox and then select the ExitQuit FirefoxQuit menu item.
- Go to your Firefox installation folder.
- Go to the extensions folder inside the installation folder.
- Follow the steps above to locate the appropriate folder to delete.
Extensions installed by other software
Sometimes installing or updating other software will add an extension which cannot be removed from within the Firefox Add-ons window because its button is not functional.
The software that added the Firefox extension may include an option to remove it. You should visit the support site of the software provider for more information. As an alternative, simply disable the extension in the Firefox Add-ons window if you no longer wish to use it. To disable the extension, select it, then click on its button. The extension will be disabled after you restart Firefox.
Microsoft .NET Framework Assistant
If you have programs that use Microsoft .NET Framework components, a Microsoft update may have installed an extension called Microsoft .NET Framework Assistant.
To remove this extension, follow the instructions in Microsoft's article How to remove the .NET Framework Assistant for Firefox.
Java Quick Starter
If you have Java software from Sun installed, you may see the Java Quick Starter extension in your list of extensions. This extension has its button disabled.
To remove this extension, follow the instructions to disable the Java Quick Starter in Sun's Java Quick Starter article. You may need to close Firefox while executing those instructions.
When you restart Firefox, the Java Quick Starter extension will be removed.
Based on information from Uninstalling add-ons (mozillaZine KB)
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