To use Android extensions, you'll need Firefox for Android. To explore Firefox for desktop add-ons, please visit our desktop site.
Find and close duplicate browser tabs — same URL open in multiple tabs
Quick access to recently closed tabs — up to 50 entries
Set tab alarms — close or alert when a tab timer expires
Schedule site blocking — keep focus during your chosen work hours
Enhanced page search with color highlights and search history
Quick typing benchmark with score and accuracy display
Quick spell-check tool for clipboard and typed text
Apply a custom cursor overlay to any webpage you visit
Browse and restore recently closed tabs with title search
Detect music BPM by tapping on screen or spacebar key
Invert page colors for comfortable night browsing
Track live mouse XY coordinates and element info on page
Open a random Wikipedia article in your language
Map every element's z-index on the current page and visualize the stacking order
Display one word at a time at any words-per-minute speed
Quickly mute unmute or solo any tab playing audio
Drag to measure any area on screen in pixels
Quickly insert emojis into text fields from popup.
Translate selected text using Google Translate API
Detect cloned tabs — list all duplicate URLs and close extras with one click
Turn any tab URL into a scannable QR code with one click
Draw freehand notes on a persistent popup whiteboard
Log daily expenses by category and track your spending
Create CSS gradients with color stops and direction
Generate a QR code for any URL or text instantly
