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- User-Agent Switcher- Easily override the browser's User-Agent string - 62 037 uživatelů
- Allow Right-Click- Re-enable the possibility to use the context menu on sites that overrides it - 50 617 uživatelů
- Cookie Quick Manager- An addon to manage cookies (view, search, create, edit, remove, backup, restore, protect from deletion and much more). Firefox 57+ is supported. - 48 247 uživatelů
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- Assinatura Digital no Navegador- Realize Assinaturas Digitais no navegador. - 39 875 uživatelů
- Nimbus Screen Capture: Screenshot, Edit, Annotate- ★ Used by Several Million users on different platforms ★ 1) Screen capture web pages 2) Selected regions 3) Whole browser window 4) Slack upload Edit screenshots. Save images as local files or Google Drive. Tools for Annotation. Upload and share - 35 666 uživatelů
- Selenium IDE- Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests. - 34 711 uživatelů
- WhatFont- A wrapper for Chengyin Liu's WhatFont tool - 32 831 uživatelů
- Disable JavaScript- Adds the ability to disable JavaScript for specific sites or specific tabs. You can customize the default JS state (on or off), the disable behavior (by domain or by tab) and much more. - 32 387 uživatelů
- cookies.txt- Exports all cookies to a Netscape HTTP Cookie File, as used by curl, wget, and youtube-dl, among others. - 30 708 uživatelů
- JavaScript-Java Bridge- A replacement for the Java Plugin so Java Applets without graphics continue to work on browsers that no longer support NPAPI plugins. Java's LiveConnect API is emulated — data & method calls can be exchanged, and Java can manipulate the webpage DOM. - 28 666 uživatelů
- Stylish - Custom themes for any website- Stylish lets you customize any website with custom user styles (themes for websites). Choose from the largest userstyles library to change the color scheme, background, and skin for Google, Facebook, YouTube and many, many more sites. - 24 028 uživatelů
- Disable WebRTC- WebRTC leaks your actual IP addresses from behind your VPN, by default. - 23 356 uživatelů
- WAVE Accessibility Extension- Evaluate web accessibility within the Firefox browser. When activated, the WAVE extension injects icons and indicators into your page to give feedback about accessibility and to facilitate manual evaluation. - 22 461 uživatelů
- CORS Everywhere- A firefox addon allowing the user to enable CORS everywhere by altering http responses. Report issues to the repository, with enough information to reproduce the problem: https://github.com/spenibus/cors-everywhere-firefox-addon/issues - 21 663 uživatelů
- SAML-tracer- A tool for viewing SAML and WS-Federation messages sent through the browser during single sign-on and single logout. - 20 202 uživatelů
- Colorpick Eyedropper- A simple eye-dropper & color-picker tool allowing you to select color values from webpages. You will need to enable the add-on bar Firefox menu->Options->Add-on Bar OR View->Toolbars->Add-on Bar Then refresh the page. - 19 743 uživatelů
- Font Finder (revived)- An easy-to-use font inspector to get CSS styles of the selected element - 18 648 uživatelů
- ImageAssistant Batch Image Downloader- An image extractor for sniffing, analyzing and batch downloading images from web page. - 18 579 uživatelů
- Media Converter and Muxer - Audio Tools- Easy to use video and audio converter and muxer written in WebExtension built on top of the well-known FFmpeg converter - 18 237 uživatelů
- Proxy přepínač SwitchyOmega- Správa a přepínání mezi více servery proxy. - 18 176 uživatelů
- JSONView- Dokumenty JSON přímo v prohlížeči. - 17 983 uživatelů
- User-Agent Switcher- Quickly and easily switch between popular user-agent strings. - 16 708 uživatelů
- Поиск Яндекс- Добавляет Яндекс к поисковым движкам. - 15 619 uživatelů
























