FoxyProxy Standard
FoxyProxy は Firefox の限定的なプロキシ機能を置き換える、高度なプロキシ管理ツールです。SwitchProxy や ProxyButton、QuickProxy、xyzproxy、ProxyTex、TorButton などよりも多くの機能を提供します。
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Download All Images
Easily save images with a wide range of customization features, such as file size, dimensions, and image type.
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User-Agent Switcher and Manager
Spoof websites trying to gather information about your web navigation—like your browser type and operating system—to deliver distinct content you may not want.
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Tab Reloader (page auto refresh)
An easy-to-use tab reloader with custom reloading time settings for individual tabs
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Clear Browsing Data
Delete browsing data directly from the browser toolbar. Clear cookies, history and cache with a single click.
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Measure-it
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
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Port Authority
Blocks malicious websites from port-scanning your computer/network and dynamically blocks all LexisNexis endpoints from running their invasive data collection scripts.
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React Developer Tools
React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the "⚛️ Components" or "⚛️ Profiler" tab.
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完全なWebページのスクリーンショット（♥♥♥♥♥）
FireShot makes full web page screenshots. Demo: http://bit.ly/RlBQMV Screenshots can be quickly captured and: ― Saved as Image or PDF ― Sent to clipboard ― Printed ― Annotated * ― Uploaded * ― E-Mailed * * OS Windows only
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ColorZilla
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
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Windscribe - Free VPN and Ad Blocker
Windscribe helps you circumvent censorship, block ads, beacons and trackers on websites you use every day.
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Web Developer
The Web Developer extension adds various web developer tools to the browser.
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Cookie-Editor
Cookie-Editor lets you efficiently create, edit and delete a cookie for the current tab. Perfect for developing, quickly testing or even manually managing your cookies for your privacy.
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