HTTP request maker
Displays a sidebar that lets you to forge HTTP requests. Press Alt+Shift+Y to show the sidebar and make your own HTTP request. You can choose the method GET, HEAD, POST, OPTIONS, PUT DELETE and the body data to send. Response in the main window.
2,987 users
CookieManager - Cookie Editor
Edit cookies related to the current page and all its sub-frames right from a popup
2,923 users
ffCK Overlays
Right-click any element to remove it. Inspired by the Chrome extension "F*ck Overlays".
2,875 users
Omnibug
The leading browser extension for analytics and marketing technology testing and debugging
2,865 users
Google Analytics Debugger
Prints useful information to the JavaScript console by enabling the debug version of the Google Analytics Javascript. P.S: this add-on is migrated from Chrome store.
2,858 users
Basic JSON Formatter
Adds a page action to pretty-print JSON. Unlike similar extensions, this simply pretty-prints it. It doesn't add any kind of viewer, colors, or collapsing. If you want this to work as expected, disable devtools.jsonview.enabled in about:config.
2,841 users
Print for Firefox
Print the current page you see with one single click. That for all kinds of photo printing, poster printing, business cards, etc.
2,660 users
Merge Windows
Merges the tabs from multiple windows together into one window. Extension won't show context menu item when there aren't more than one window of the same type to merge together. Private windows will only merge with private windows not normal.
2,583 users
webhint
Check for best practices and common errors with your site's accessibility, speed, security and more.
2,582 users
Color Picker For Firefox
HEX Color Picker, RGB Color Picker, Color Picker EyeDropper, Pick color from web page (Color Picker For Firefox)
2,573 users
dataslayer
Debug and test tag management (Google Tag Manager, Adobe Launch / DTM, Tealium) and analytics (Google Analytics, Adobe Analytics) implementations from within Developer Tools.
2,528 users
Signer.Digital Digital Signature, PKI
Signer.Digital - Digital Signing of eReturns, PDF Signing and Web User Auth, RSA Encryption/Decryption. JULY 2022 - Added support for ICP-Brazil and ITIDA Egypt.
2,447 users
Pesticide
This extension inserts the Pesticide CSS into the current page, outlining each element to better see placement on the page.
2,423 users
ReCaptcha Solver
Verify Google ReCaptcha V2 automatically with :2Captcha, DeathByCaptcha, ImageTyperz, RuCaptcha, Anti-Captcha, BestCaptchaSolver and EndCaptcha Without API or TOKEN key it won't work!!
2,396 users
HackTools
Hacktools, is a web extension facilitating your web application penetration tests, it includes cheat sheets as well as all the tools used during a test such as XSS payloads, Reverse shells to test your web application.
2,391 users
