XPath Helper
Quickly get the XPath for any element on a webpage with just one click. Simply select an element and it will display its XPath.
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Toggley
Switch between the default themes: Toggley is a Light / Dark mode toggle button for Firefox.
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Dummy Form Filler
One click to populate HTML forms with dummy data. Works out of the box.
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Trello Card ID
Shows Trello card IDs for use in commits and for other quick references. Copy the ID to the clipboard by clicking on it.
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谷歌服务助手
主要用于开发者访问Google 、Android等网站，简单易 使用，自由零距离。如果你是一名学者，你也可以用于 学术用途访问谷歌学术。值得注意的是这款附加组件并 不支持访问搜索结果中的所有网站，非常抱歉。如果你 想继续访问，可以尝试通过使用在线代理工具或安装支 持全局代理的火狐插件， 如Hoxx VPN。 插件来源于Chrome拓展商店，联系侵删。
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Twitch Text Emotes - temotes
Save your favorite text phrases ("LULW", "KEKW", emoticons, etc.) directly into the standard Twitch Emotes panel and use them in Twitch chat. Simple and useful.
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Measure Element
Shows width, height, or alignment of selected area at anywhere on webpage in pixels.
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SpeedVitals
Perform Web Vitals Test & TTFB Test on Multiple Locations & Devices. SpeedVitals Extension helps measure the performance of a website directly from that website itself.
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Ghost Inspector - Web Test Recorder
Ghost Inspector is an automated browser testing service. Our add-on allows you to record yourself performing actions on your website within your browser, then sync them to the Ghost Inspector service and run them continuously as a regression test.
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The Stream Detector PLUS
Detects playlists and subtitles used by streams, incl. custom file extensions and headers. Assembles readymade commands for tools.
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Headers
Take control of your web requests with the Headers extension for Firefox! This powerful tool allows you to effortlessly add, modify, or remove HTTP headers for any website you visit, giving you enhanced privacy, security, and customization options.
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JSON Editor
A JSON Editor Extension based on the amazing JSON Editor Online https://github.com/josdejong/svelte-jsoneditor Source code: https://github.com/fractalf/json-editor-ex
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ClickJacking
ClickJacking is a tool developed by Pentester Helper to help website owners determine if their website is vulnerable to clickjacking.
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SEOInfo
Shows SEO issues as you navigate pages. Displays performance data, redirects, structured data and errors for HTML pages. Save to Excel.
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Canvas Blocker - Fingerprint Protect
Prevent HTML canvas element from generating a unique identification key to protect user's privacy
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CSP Content Security Policy Generator
Best Content-Security-Policy generator to automatically create Strict CSP policies (with SHA support) for any website.
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YT Nonstop
No more 'Video paused. Continue watching?' confirmation box! And with two extra options: 1) disable autoplay; 2) loop playlist.
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mSession Keeper
An extension to keep your web-sessions alive. Maintains active sessions of Web Applications, that have an inactivity timeouts. Based on Session Keeper by Guillaume Boudreau.
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LoadTabOnSelect
Load newly-opened background tabs on selection, rather than automatically in the background. This addon uses the WebExtensions API, and therefore fully supports Firefox 57+.
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gRPC-Web Developer Tools
gRPC-Web Developer Tools for debugging application's gRPC-Web network requests.
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Sitemap Explorer: Check and View XML Sitemaps
This extension helps you find, inspect, export, and view XML Sitemap files for any site you navigate in a browser.
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Shadertoy Custom Texures
Allows you to use custom 2D textures, music and videos in Shadertoy. To load an image, drag and drop it (either from your computer or from the web) onto one of the texture preview slots.
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