Open Source - Firefox add-ons

Firefox Language Pack for Afrikaans (af)

Userscript support for browsers, open source.

Make the web faster, more private, and more secure.

Get free text of research papers as you browse, using Unpaywall's index of ten million legal, open-access articles.

Putting Flash back on the web. Designed to be easy to use, this extension will seamlessly enable you to play flash content, with no extra configuration required!

Integrates the D&D Beyond Character Sheet into Roll20 and Foundry VTT.

A strict British-English spell checker dictionary for Firefox, Thunderbird and SeaMonkey. This dictionary only includes words conforming to the preferred standard of British-English spelling.

Re-implements the google image, "View Image" button.

Track time from anywhere on the web and improve productivity.

Slovak spell checking dictionary for Mozilla applications (based on the "open-source" dictionaries by Zdenko Podobný).

Markdown Viewer with 30+ Themes, Dark Mode, MathJax, Mermaid diagrams, Syntax Highlighted code blocks

Scan and decode QR Code. Internet is not required.

Quick Dial, a speed dial page inspired from fast dial. Full Open Source, No Web Service, No Cloud Account, your data is your own.

Playback controls (with J and L) and timestamp on YouTube Shorts.

The extension is a local copy of the DjVu.js Viewer which is available on https://djvu.js.org/. It allows you to open links to .djvu files right in the browser and .djvu files from a local drive. Also, it processes tag with .djvu files.

UI customizations and tweaks for the web version of YNAB.

Improved YouTube chat with CPU/RAM optimizations, customization options, and cutting-edge features!

Provides better experience for using the Hoppscotch web app. Haven't used Hoppscotch ? It's an amazing quick API Request Builder. Try it at https://hoppscotch.io/ !!!

Browser syncing as it should be: secure, anonymous and free! Sync bookmarks across your browsers and devices, no sign up required.

Displays a rating bar (likes/dislikes) on the bottom of every YouTube thumbnail.

Detect and Download M3U8 HLS Streams and media files from your browser! (Does not work with YouTube). Completely free, open-source!

A feature-packed, customizable reader extension.

This will fix all embedded Photo Bucket images on forums and other websites. Source Code: https://github.com/Ryan-Myers/photobucket-embed-fix Ported from the Chrome extensions code: https://github.com/kzahel/photobuck

Corrector ortográfico de galego baseado na Normativa da RAG do 2003. Conten a versión comunidade. -- Galician spellchecking dictionary based on the 2003 RAG Standard. This extension contains the version comunidade.

Download from SVT Play and other services. On computers this extension requires FFmpeg. On Android this extension requires the app "Seal".