To use Android extensions, you'll need Firefox for Android. To explore Firefox for desktop add-ons, please visit our desktop site.
Fast markdown notepad with formatting and storage
Rename any browser tab's title and save the name for that URL
Decode and inspect JWT tokens with header payload and exp
Edit the title of any tab and pin custom names to specific URLs
Real-time cursor position tracker with viewport metrics
Search any chemical element and view its properties
Test your typing speed in WPM with live accuracy meter
Override any site's CSS with your own rules — saved per domain
Quickly insert emojis into text fields from popup.
Convert any time between two time zones instantly
Count words chars sentences and reading time for any text
Automatically pauses all media when you switch away from the tab
Sniff the tech stack — detect React, Vue, WordPress, jQuery and 30+ more
Meter your reloads — badge counter for how often each tab refreshes
Zap fixed-position banners, cookie bars and sticky headers instantly
See how often you visit each site — domain frequency tracker
Generate formatted Markdown tables by adding rows visually
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
Shows cookie count badge for the current site and detailed cookie list
Classic 25-5 pomodoro timer with session tracking
Quick access to recently closed tabs — up to 50 entries
Find and close duplicate browser tabs — same URL open in multiple tabs
