Firefox Extensions are add-ons that allow users to customize their web browser from Mozilla. They are downloadable through the Firefox Add-on website. Modern extensions follow WebExtension standard and are most often written in HTML, JavaScript, and CSS.

An awesome browser extension that reads aloud webpage content with one click

• UpdatedFeb 6, 2026
• JavaScript

userChromeJS / autoconfig.js and extensions

• UpdatedFeb 10, 2025
• JavaScript

Make your production flow

• UpdatedJun 1, 2025
• JavaScript

Chrome/Firefox extension for pen-testing to retrieve encryption keys of Widevine protected content !DON'T DECRYPT CONTENT UNLESS YOU HAVE THE RIGHT TO DO IT!

• UpdatedOct 29, 2024
• JavaScript

Automatically skip Ads, Intros, Credits, etc. on all major Streaming services

• UpdatedFeb 14, 2026
• JavaScript

Upgrade your designs with our browser extension! Download premium SVG icons and stickers from Flaticon, Icons8, and Iconscout hassle-free. No more costly subscriptions.

• UpdatedJul 6, 2025
• JavaScript

"Emoji" is a Firefox add-on where you can find emojis and copy them with a single click.

• UpdatedJul 24, 2025
• JavaScript

A Firefox extension

• UpdatedJun 6, 2022
• JavaScript

Auto Click Auto Fill on any web page

• UpdatedAug 15, 2025
• HTML

A browser extension that alerts you when you navigate to a website belonging to an organization whose employees are on strike.

• UpdatedMar 24, 2025
• JavaScript

Automatically change Firefox's theme based on the time

• UpdatedJun 8, 2024
• JavaScript

Take notes on every website in a smart and simple way!

• UpdatedFeb 1, 2026
• JavaScript

Securely collect browsing history over browsers.

• UpdatedJul 16, 2021
• JavaScript

Une extension Firefox pour trouver et réserver automatiquement votre créneau de vaccination COVID-19.

• UpdatedDec 17, 2021
• JavaScript

Modify requests, inject JavaScript and CSS into pages

• UpdatedJul 7, 2022
• JavaScript

Firefox extension that unlocks songsterr plus/premium cuz FUCK them!!! :D

• UpdatedNov 28, 2023
• JavaScript

⏯ | A lightweight browser extension that enables YouTube for TV in your browser

• UpdatedAug 6, 2024

Environment Marker browser extension

• UpdatedJan 21, 2026
• JavaScript

chrome extension to firefox extension converter

• UpdatedFeb 9, 2026
• Rust

Select link's text just like a regular text (like in Opera'12 browser) - Select like a Boss ;)

• UpdatedJan 16, 2026
• TypeScript