Google Lighthouse
Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.
15 561 brukere
SeoQuake SEO extension
Accelerate your SEO efforts on the fly. SEOquake is a free plugin for browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.
15 419 brukere
My IP Hider VPN
My IP Hider VPN is number one tool for hiding your IP and unblocking any web site! If your Firefox version is less then 55 please install older My IP Hider VPN from "Version History" (https://goo.gl/7ZQQjZ)
14 432 brukere
Lightning Autofill
The most popular autofill extension, boosting productivity since 2010.
13 595 brukere
JavaScript Toggle On and Off (WebExtension)
Toggle JavaScript engine on and off the easy way
13 260 brukere
javascript
add javascript that will run on this domain. back up your scripts in the options area (shortcut there by clicking the "JS" letters in the bottom right)
12 581 brukere
Fake Filler
A form filler that fills all form inputs (textboxes, textareas, radio buttons, dropdowns, etc.) with fake and randomly generated data. The purpose of this extension is to help developers and testers test forms quickly and easily.
12 181 brukere
Flag Cookies
A cookie and browser storage data manager on steroids to mark, 'flag', and manage cookies using rulesets.
11 961 brukere
Simulateur mobile
Simulateur de smartphone sur ordinateur très réaliste avec plusieurs modèles disponibles pour tester son site mobile.
11 646 brukere
Header Editor
Manage browser's requests, include modify the request headers and response headers, redirect requests, cancel requests
10 921 brukere
Allow CORS: Access-Control-Allow-Origin
Easily add (Access-Control-Allow-Origin: *) rule to the response header.
10 757 brukere
IP Address and Domain Information
The Ultimate online investigation tool! See detailed information about every IP Address, Domain Name and Provider.
10 666 brukere
Proxy Toggle
Toggle between direct connection and a single proxy server via a toolbar icon.
9 926 brukere
axe DevTools® - Web Accessibility Testing
Add accessibility auditing to the Firefox Developer Tools
9 613 brukere
