Firefox extensions

SaaY List by SaaY , last updated Jan 6, 2026

Dark Reader
Like
https://addons.mozilla.org/en-US/firefox/addon/darkreader/
Cost / License
Free
Open Source
Application type
Dark Mode Enforcer
Platforms
iPhone
iPad
Microsoft Edge
Google Chrome
Safari
Thunderbird
Mozilla Firefox
+1
FastForward
Like
https://addons.mozilla.org/en-US/firefox/addon/fastforwardteam/
Cost / License
Free
Open Source
Application type
URL Shortener
Platforms
Microsoft Edge
Vivaldi Browser
Google Chrome
Opera
Firefox
Internet Download Manager
Like
https://addons.mozilla.org/en-US/firefox/addon/tonec-idm-integration-module/
Cost / License
Paid
Proprietary
Application types
Video Downloader
Download Manager
Platforms
Windows
Microsoft Edge
Google Chrome
Mozilla Firefox
+5
KeePassXC
Like
https://addons.mozilla.org/en-US/firefox/addon/keepassxc-browser/
Cost / License
Free
Open Source
Application types
Password Manager
Authenticator
Platforms
Mac
Windows
Linux
AppImageHub
Snapcraft
Microsoft Edge
Google Chrome
Flathub
PortableApps.com
Flatpak
Homebrew
Chocolatey
Mozilla Firefox
+13
LanguageTool
Like
https://addons.mozilla.org/en-US/firefox/addon/languagetool/
Cost / License
Freemium
Open Source
Application types
Grammar Checker
AI Writing Tool
Platforms
Mac
Windows
Linux
Online
iPhone
iPad
Microsoft Edge
ONLYOFFICE
Google Chrome
Microsoft Outlook
Safari
Visual Studio Code
Microsoft Word
Eclipse
TinyMCE
Google Docs
Thunderbird
Vim
Sublime Text
GNU Emacs
Opera
Gmail
LibreOffice
Apache OpenOffice
Mozilla Firefox
LibreOffice - Writer
Cloudron
+4
MAL-Sync
Like
https://addons.mozilla.org/en-US/firefox/addon/mal-sync/
Cost / License
Free
Open Source
Application type
Anime / Manga Tracking App
Platforms
Mac
Windows
Linux
Android
Chrome OS
Google Chrome
Violentmonkey
Mozilla Firefox
Tampermonkey
Obsidian Web Clipper
Like
https://addons.mozilla.org/en-US/firefox/addon/web-clipper-obsidian/
Cost / License
Free
Open Source
Application types
Bookmark Manager
Read It Later Tool
Platforms
Mac
iPhone
iPad
Google Chrome
Safari
Mozilla Firefox
+1
Progressive Web Apps for Firefox
Like
https://addons.mozilla.org/en-US/firefox/addon/pwas-for-firefox/
Cost / License
Free
Open Source
Platforms
Mac
Windows
Linux
Mozilla Firefox
+3
Search by Image
Like
https://addons.mozilla.org/en-US/firefox/addon/search_by_image/
Cost / License
Free
Open Source
Application type
Image Search Engine
Platforms
Mac
iPhone
iPad
Microsoft Edge
Google Chrome
Samsung Galaxy Store
Opera
Mozilla Firefox
+5
Stylus
Like
https://addons.mozilla.org/en-US/firefox/addon/styl-us/
Cost / License
Free
Open Source
Application type
User Styles Manager
Platforms
Microsoft Edge
Google Chrome
Opera
Brave
Chromium
Mozilla Firefox
+2
Tampermonkey
Like
Extension: https://addons.mozilla.org/en-US/firefox/addon/tampermonkey/

Userscripts

Vencord

Undiscord

Claude Chat TOC Navigator

Claude API Exporter

Cost / License
Free
Proprietary
Application type
Userscript Manager
Platforms
Mac
Windows
Linux
Android
Microsoft Edge
Google Chrome
Opera
Chromium
Firefox
+2
uBlock Origin
Like
Extension: https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/

Filters: Default + FMHYFilterlist More: https://github.com/yokoffing/filterlists
Cost / License
Free
Open Source
Application types
Ad Blocker
Privacy Tool
Platforms
Microsoft Edge
Vivaldi
Google Chrome
Pale Moon
Thunderbird
Opera
Node.JS
Chromium
Mozilla Firefox
Web Archives
Like
https://addons.mozilla.org/en-US/firefox/addon/view-page-archive/
Cost / License
Free
Open Source
Platforms
Microsoft Edge
Google Chrome
Safari
Opera
Firefox
+1

Comments

Darlene Sonalder

CommentJan 7, 2026

0

What about Violentmonkey icon Violentmonkey and Greasemonkey icon Greasemonkey ? I don't like having proprietary extensions in my web browser, especially if good foss alternative exists.

Gu