External Application Button (WebExtension)
A highly customizable external application button and context-menu items
983 users
Edit Anything
Edit Anything from Chrome is now on Firefox. Before It was on Chrome. Click icon to turn on. sets contentEditable to true. Click to set false. If on then click text/any other element and make the changes. Changes don't persist after reload.
973 users
Online Tools by 10015.io
Case converter, image cropper, CSS triangle generator, base64 encoder/decoder, HEX to RGBA converter, YouTube thumbnail grabber, QR code generator and many more online web tools
971 users
OpenLorem
Lorem Ipsum filler text for web developers. Uses Loripsum, Bacon Ipsum and Dino Ipsum APIs to retrieve customized text. Insert into fields using context menu. Source code is available on Github.
966 users
show-my-ip
This add-on allows you to view your IP address from your browser without having to navigate to sites like https://www.whatismyip.com/ Furthermore, as this add-on is open source, you don't need to be worried about your privacy.
963 users
Advent of Code Charts
Inject charts in your private leaderboard page for Advent of Code - see https://github.com/jeroenheijmans/advent-of-code-charts
952 users
Quick Accept-Language Switcher
Provides a quick way of changing the HTTP Accept-Language header so you can view and test websites with a different locale.
949 users
CustomCSS Injector
- Apply any CSS rules for any websites, including iframes. - Whitelist and Blacklist functionality - Apply CSS rules to specific URLs, Domains or Globally - Syntax highlighting & line numbers - Update without page refresh
940 users
Resize Window & Viewport
Resize browser window or viewport to desired screen widths. Firefox's Responsive Design Mode (Ctrl + Shift + M) is great for mobile devices emulation.
923 users
PageSpeed Insights
Open PageSpeed Insights to analyze the web page on the current opened tab.
911 users
Slither.io Mods, Zoom, Unlock Skins, Bots
The Best Mod and Extension for Slither.io! Mod Zoom, Play with Friends, Skins, Custom Skins, Bots
904 users
Rotate that Video Player
Improve your video experience by effortlessly rotating your video clips by 90, 180, or 270 degrees.
893 users
Flash Debugger
Debug Flash/SWF/Flex files on the web. Edit properties and inspect elements on the fly. View log output inside the extension. Run AS3 code against the active SWF. Profile memory consumption and much much more...
884 users
SQLite Viewer
A tabular SQLite viewer and editor that supports opening of multiple databases
880 users
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
870 users
Mangools SEO extension
Speed up your SEO right in your browser: See the key SEO metrics, popularity trends, competitor's keywords, backlinks and on-page SEO insights of any domain or URL. Have the power of Mangools SEO package any time you need.
868 users
HackBar
A HackBar for new firefox. This addon is written in webextension and alternatives to the XUL version of original Hackbar.
867 users
