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Firefox extension

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firefox-extension logo

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.

Here are 4,502 public repositories matching this topic...

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cat-catch

xifangczy / cat-catch

Star 22.9k

猫抓 浏览器资源嗅探扩展 / cat-catch Browser Resource Sniffing Extension

javascript chrome-extension jquery firefox chrome video-downloader firefox-extension m3u8-downloader
  • Updated Nov 7, 2026
  • JavaScript

AutomaApp / automa

Sponsor
Star 21.7k

A browser extension for automating your browser by connecting blocks

javascript chrome-extension workflow automation vue firefox-extension browser-extension hacktoberfest browser-automation
  • Updated Mar 2, 2026
  • Vue

ajayyy / SponsorBlock

Star 14.1k

Skip YouTube video sponsors (browser extension)

chrome-extension firefox chrome youtube opera chromium firefox-extension adblock web-extension youtube-videos adblocker hacktoberfest sponsored-segments sponsorblock
  • Updated Nov 7, 2026
  • TypeScript

Anarios / return-youtube-dislike

Star 13.8k

Chrome extension to return youtube dislikes

chrome-extension firefox youtube firefox-addon firefox-extension dislike dislikes dislikes-count dislike-button
  • Updated Nov 7, 2026
  • JavaScript
ext-saladict

crimx / ext-saladict

Star 13.4k

🥗 All-in-one professional pop-up dictionary and page translator which supports multiple search modes, page translations, new word notebook and PDF selection searching.

react chrome-extension firefox chrome typescript rxjs extension dictionaries firefox-addon webextension firefox-extension saladict
  • Updated Nov 6, 2026
  • TypeScript

ChatGPTBox-dev / chatGPTBox

Star 10.8k

Integrating ChatGPT into your browser deeply, everything you need is here

chrome-extension safari-extension firefox-addon firefox-extension browser-extension edge-extension chatgpt
  • Updated Nov 9, 2026
  • JavaScript
buster

dessant / buster

Sponsor
Star 9.4k

Captcha solver extension for humans, available for Chrome, Edge and Firefox

chrome-extension recaptcha captcha firefox-extension browser-extension captcha-solving captcha-solver
  • Updated Nov 11, 2026
  • JavaScript
simpread

Kenshin / simpread

Star 8.7k

简悦 ( SimpRead ) - 让你瞬间进入沉浸式阅读的扩展

react chrome-extension firefox chrome firefox-addon firefox-extension reader readability reading-list crx
  • Updated Sep 5, 2026
  • JavaScript
floccus

floccusaddon / floccus

Star 8.6k

☁️ Sync your bookmarks privately across browsers and devices

chrome-extension firefox sync chrome firefox-addon bookmark nextcloud owncloud webdav bookmarks webextension firefox-extension browser-bookmarks edge-extension syncing-bookmarks nextcloud-bookmarks sync-solution
  • Updated Nov 12, 2026
  • TypeScript
omni

alyssaxuu / omni

Sponsor
Star 7.9k

The all-in-one tool to supercharge your productivity ⌨️

javascript chrome-extension productivity firefox chrome interface firefox-addon spotlight bookmark history commands bookmarks raycast firefox-extension dark shortcuts bookmarks-manager tabs-management omnisearch
  • Updated Jan 11, 2024
  • JavaScript

openstyles / stylus

Star 7k

Stylus - Userstyles Manager

chrome-extension privacy opera-addon stylish firefox-extension userstyles usercss
  • Updated Nov 1, 2026
  • JavaScript
chatgpt-advanced

interstellard / chatgpt-advanced

Star 6.4k

WebChatGPT: A browser extension that augments your ChatGPT prompts with web results.

chrome-extension ai firefox-addon firefox-extension browser-extension chatgpt
  • Updated Aug 13, 2024
  • TypeScript
QOwnNotes

pbek / QOwnNotes

Sponsor
Star 6k

QOwnNotes is a plain-text file notepad and todo-list manager with Markdown support and Nextcloud / ownCloud integration.

chrome-extension markdown c-plus-plus qt dropbox notebook notes bookmark nextcloud owncloud caldav firefox-extension pim note-taking pkm nextcloud-notes qownnotes local-first second-brain llm
  • Updated Nov 12, 2026
  • C++
PixivBatchDownloader

xuejianxianzun / PixivBatchDownloader

Star 5.8k

Powerful Pixiv batch downloader. Batch download artworks and novels, filter works, rename when downloading, convert animated images, and more. 浏览器扩展程序,批量下载 Pixiv 上的插画和小说。过滤作品、下载时重命名、转换动态图片等。

chrome-extension chrome downloader firefox-extension novel pixiv edge-extension pixiv-downloader illust
  • Updated Oct 29, 2026
  • TypeScript
extension.js

extension-js / extension.js

Star 5.2k

The cross-browser extension framework.

react chrome-extension typescript vue preact firefox-addon hmr svelte webextension dev-server firefox-extension cross-browser build-tool browser-extension web-extension chrome-extensions zero-config edge-extension manifest-v3 safari-web-extension
  • Updated Nov 12, 2026
  • TypeScript
notion-enhancer

notion-enhancer / notion-enhancer

Star 5k

An enhancer/customiser for the all-in-one productivity workspace Notion

chrome-extension windows macos linux productivity firefox integrations chrome hack extensions mod themes edge firefox-extension mods enhancer notion edge-extension mod-loader notion-enhancer
  • Updated Feb 28, 2026
  • JavaScript

honestbleeps / Reddit-Enhancement-Suite

Sponsor
Star 4.6k

Reddit Enhancement Suite

chrome-extension reddit firefox-addon firefox-extension hacktoberfest edge-extension
  • Updated Nov 11, 2026
  • JavaScript

OhMyGuus / I-Still-Dont-Care-About-Cookies

Star 4.3k

Debloated fork of the extension "I don't care about cookies"

chrome-extension firefox firefox-addon firefox-extension browser-extension
  • Updated Nov 12, 2026
  • JavaScript

RetireJS / retire.js

Sponsor
Star 4.2k

scanner detecting the use of JavaScript libraries with known vulnerabilities. Can also generate an SBOM of the libraries it finds.

javascript chrome-extension security scanner grunt-plugins firefox-extension build-tool vulnerabilities software-composition-analysis vulnerable-libraries insecure-libraries sbom sbom-generator sbom-tool
  • Updated Nov 11, 2026
  • JavaScript

libredirect / browser_extension

Sponsor
Star 4.1k

A browser extension that redirects popular sites to alternative privacy friendly frontends

chrome-extension youtube privacy twitter webextension quora firefox-extension libre invidious nitter bibliogram
  • Updated Nov 10, 2026
  • JSON

Created by Mozilla

Released April 4, 2006

Followers
357 followers
Website
github.com/topics/firefox-extension
Wikipedia
Wikipedia

Related topics

browser firefox mozilla webextension
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