To use Android extensions, you'll need Firefox for Android. To explore Firefox for desktop add-ons, please visit our desktop site.
Count words chars sentences and reading time for any text
Override any site's CSS with your own rules — saved per domain
Quickly insert emojis into text fields from popup.
Sniff the tech stack — detect React, Vue, WordPress, jQuery and 30+ more
Convert any time between two time zones instantly
Generate formatted Markdown tables by adding rows visually
See how often you visit each site — domain frequency tracker
Fill any web form instantly from saved profiles with one click
Flip colors between HEX and RGB/HSL formats with picker
Quick reference for productivity keyboard shortcuts
Randomize or spoof your browser User-Agent with one click
Shows cookie count badge for the current site and detailed cookie list
Classic 25-5 pomodoro timer with session tracking
Set tab alarms — close or alert when a tab timer expires
Schedule site blocking — keep focus during your chosen work hours
Quick access to recently closed tabs — up to 50 entries
Find and close duplicate browser tabs — same URL open in multiple tabs
Detect music BPM by tapping on screen or spacebar key
Browse and restore recently closed tabs with title search
Apply a custom cursor overlay to any webpage you visit
Enhanced page search with color highlights and search history
Quick spell-check tool for clipboard and typed text
Track live mouse XY coordinates and element info on page
Display one word at a time at any words-per-minute speed
Open a random Wikipedia article in your language
