Click Firefox in the top-left corner of the browser.
Choose Add-ons from the right column of the menu to open an Add-ons Manager tab in the active browser window.
If you're using Windows XP, click Tools from the menu bar near the top of the browser window and choose Add-ons.
Click Extensions to view the installed extensions that add features to Firefox or click Plugins to view plugins that add compatibility and functionality.
Find the add-on to disable and click Disable.
To delete an extension entirely, click Remove.
Restart Firefox to complete the process.
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