Capture Full Page Screenshot
Capture a screenshot of your current page according to visible and fullpage with just one click
1 019 användare
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.
1 018 användare
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.
996 användare
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.
981 användare
Advent of Code Charts
Inject charts in your private leaderboard page for Advent of Code - see https://github.com/jeroenheijmans/advent-of-code-charts
975 användare
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
955 användare
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
944 användare
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.
944 användare
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.
944 användare
Slither.io Mods, Zoom, Unlock Skins, Bots
The Best Mod and Extension for Slither.io! Mod Zoom, Play with Friends, Skins, Custom Skins, Bots
937 användare
HackBar
A HackBar for new firefox. This addon is written in webextension and alternatives to the XUL version of original Hackbar.
929 användare
PageSpeed Insights
Open PageSpeed Insights to analyze the web page on the current opened tab.
928 användare
极客侧边栏：支持全球顶尖AI、书签云管理
集成了包括 ChatGPT、Claude、Grok、Gemini、DeepSeek、Qwen 等在内的全球多款顶尖大模型。一站式整合AI助手+书签云管理+效率工具，支持书签查重、书签有效性检测、AI整理书签、网页总结、文档分析、网页截图等强大功能。让侧边栏化身成你的超级工作台！
916 användare
SQLite Viewer
A tabular SQLite viewer and editor that supports opening of multiple databases
915 användare
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.
910 användare
External Application Button (WebExtension)
A highly customizable external application button and context-menu items
906 användare
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.
905 användare
Block Yourself from Analytics
Block your Google Analytics™ activity for the websites you own, no more false stats.
901 användare
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...
899 användare
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.
896 användare
