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.
1,067 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.
1,058 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
1,051 users
Save to Trello
This firefox extension allows you to Create a Trello card from any webpage (including Gmail/webmail) / Ideal for Inbox Zero. You can save the current page to Trello. When you find something in Firefox that you want to view later put it in Trello.
1,050 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
1,041 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...
1,038 users
Dark Mode Website Switcher
Adjusts the website's color scheme, so that all websites are dark by default, if they have a special design for that. It makes websites look dark even with a light system style.
1,029 users
Scrum for Trello
Scrum for Trello adds functionality to the awesome trello.com for use in Scrum projects. Add estimates or record time-spent directly on Trello cards. Shows sums at the top of each list and the top right corner of each board.
1,017 users
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
1,015 users
Table to CSV
Save HTML Tables, CSS Pseudo/DIV Tables or Lists (UL/OL) as a comma seperated values (CSV) file which can be opened with any spreadsheet processor (e.g. excel, libreoffice-calc,gnumeric) for further processing and conversion (e.g. to xls or ods)
999 users
SEO Inspector
SEO Inspector scans the active page and applies a set of customizable rules to its contents. The results of the scan are displayed on a simple, elegant interface for manual inspection.
991 users
HackBar
A HackBar for new firefox. This addon is written in webextension and alternatives to the XUL version of original Hackbar.
989 users
PageSpeed Insights
Open PageSpeed Insights to analyze the web page on the current opened tab.
980 users
SQLite Viewer
A tabular SQLite viewer and editor that supports opening of multiple databases
972 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.
950 users
InlineDisposition Reloaded
InlineDisposition Reloaded changes the disposition type of "Content-Disposition" response headers from "attachment" and "file" to "inline"
937 users
Simple Link Checker
Redirect Link Checker will check all links on your page to find broken and redirect links
937 users
Lighthouse Report Generator
Generates a Lighthouse Report without needing to use Chrome or the Lighthouse CLI
933 users
