To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
- Any Firefox
- Firefox 44.0
- Firefox 43.0
- Firefox 42.0
- Firefox 41.0
- Firefox 27.0
- Firefox 26.0
- Firefox 16.0
- Firefox 11.0
62 matching results
Search Results for tag "css"
UserStyles™ No Restart
UserStyles™ allows you to change any website's appearance; Choose your desired style from userstyles.org
Custom Style Script No Restart
HTML Content Blocker No Restart
Blocks desired HTML contents (script, style, image, object, media)
Youtube Dark Purple No Restart
Makes the layout of Youtube match the dark style of the navigation bar of Twitch while retaining the original feel.
DevTools Prototyper No Restart
This add-on adds JS Fiddle style code prototyping to Firefox DevTools.
pesticide No Restart
Cascading Style Sheets can be tricky. Placing an outline on every element can help you figure out what is going on.
This extension inserts the Pesticide CSS into the current page, outlining each element to better see placement on the page.
Provides global user stylesheet.
superUserContent No Restart
Dynamically load stylesheets from plaintext files in your profile
Speed up your testing and debugging times with PourBico. By intercepting HTTP requests, PourBico allows you to modify each response (headers and body) via inline edits or by replacing resources with local or external ones.
Quicker access to several Stylish features through a toolbar button and/or keyboard shortcuts. Available for Firefox, Thunderbird, and SeaMonkey
A tool to design frames directly in the web page. The integrated color picker supports also harmonic colors. Operating notes see the tooltips.
Originz No Restart
A source viewer that enables you to view not only page's HTML source but also style sheets and scripts. It uses Prism syntax highlighter and it can beautify(unminify) the source code.
SiteCheckr No Restart
Analyzes your websites with your custom ruleset.
Ad-blocker for Gmail No Restart
Hide ads in Gmail, and more cool stuff, simply with CSS.
Stylish Sync No Restart
Sync engine for Stylish with backup / restore facility.
User Style Manager No Restart
Easiest way to Add and Manage Custom User Styles in Firefox.
Add, Edit, enable, disable and delete in-numerous User Style Sheets to redesign the Firefox and the Web.
This add-on is not compatible with your version of Firefox because of the following:
- Add-on has opted into strict compatibility checking.
Reload all stylesheets in a page using a customizable hotkey or button.
Access and activate the native Firefox Web Developer tools faster through this toolbar button (menu). Button can be placed on any toolbar.