How to Remove a Browser Extension from Mozilla FireFox BTech BTech Alerts & Notifications - Check this page for the latest information on emergencies and system outages. All times are Pacific. Browser Support Guides: Browsers Mozilla FireFox Overview Removing browser extensions helps improve performance, enhance security, protect privacy, prevent compatibility issues, and reduce browser clutter. Steps to Perform Open Firefox. Click the Menu button in the top right corner. Click Add-ons and themes. Click Extensions. Find the extension you want to remove. Click the ellipsis (three dots (...)) next to the extension. Click Remove. Confirm the removal.