Need to test your web pages out in Internet Explorer, Chrome, Safari, Opera (or anything else for that matter)?
Cost / License
- Free
- Open Source
Alerts
- Discontinued
Platforms
- Windows
- Pale Moon
- SeaMonkey
- Mozilla Firefox

Browse 1,948 Mozilla Firefox Plugins, Add-ons and extension on AlternativeTo including popular Mozilla Firefox options.
Need to test your web pages out in Internet Explorer, Chrome, Safari, Opera (or anything else for that matter)?

NewsFox is an efficient 3-pane(email) style Atom/RSS feed reader. NewsFox allows you to group your feeds as you wish, read feed content offline, update feeds when you want, 1-click subscribe with the Firefox URL bar icon, and read other feeds while updating.

An essential add-on for power users that have many tabs open. Curb your resource usage by unloading tabs that you haven't visited for a while. An unloaded tab is restored back to its original state when you need it again.

The first dedicated pop-under blocker!
Block all these annoying popups and popunders that pop no matter where you click on a page. No configurations. Easy options. Transparent in use.


Research Wheel is a local-first browser extension designed to speed up developer research, note-taking, and citation gathering. By holding middle-click on any webpage, users can invoke a 360° radial menu to quickly trigger actions without switching tabs or navigating...







Use the design system you already have. Extract design tokens from websites and use them in code and in your design tool.



Password Depot is a powerful and very user-friendly password manager which helps to organize all of your passwords. But also, for instance, information from your credit cards or software licenses.




Online library of books, academic texts and tools, trusted by students worldwide. Get access to thousands of eBooks online.








Extension that converts Web Novels (and other web pages) into an EPUB for offline reading. Works with many sites, including:

A Chrome extension that brings the simplicity of Google Inbox to Gmail. It has a free trial of 30 days, then you will have to pay.


Persistent Twitch quality control: lock resolutions, toggle presets, auto-reapply. No more manual resets - across Chrome, Edge, Brave, Opera, Vivaldi, Arc, Zen, and Firefox.


A modern, cross-browser speed dial that respects your privacy, inspired by Opera. Its available as an extension to Chrome and an Addon for Mozilla Firefox



A simple browser extension to bypass YouTube's age verification and watch age restricted videos without having to sign in.

TiSPY is leading parental control software which allows parents to track kids smartphone activities. TiSPY client can track all data of device including SMS, Call Log, Web History, Application List, Mobile SD Card, Social Media applications and more.



RefControl is an extension for Firefox that lets you control what gets sent as the HTTP Referer on a per-site basis.

FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

New Tab Override was developed from the ground up as so-called WebExtension. This makes New Tab Override compatible with Firefox 57 and later. Not all options of the previous version are currently available as WebExtension.




StoriesOnBoard helps product managers, product owners, and business analysts understand customer needs, automate feedback collection, develop feature ideas, prioritize and validate what to develop next with a public roadmap, and rally all stakeholders around the story map.





YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. YSlow is a Firefox add-on integrated with the Firebug web development tool.
This extension provides unlinkable cryptographic tokens for websites that support the Privacy Pass protocol. For example, these tokens can be used on Cloudflare-protected websites to redeem a token instead of solving a CAPTCHA.




WAVE is a visual web accessibility analysis tool that evaluates web accessibility based on the Web Content Accessibility Guidelines (WCAG).