Upside-down web
This plugin rotates all websites by 180deg and gives you a different look at the web! It will try to rotate all websites and will work on most of them. Firefox preferences and settings are not effected. It stops when you deactivate the plugin.
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Page Content to Markdown
Save any web page as clean Markdown. Full page or selected elements. Site-aware on X, Claude, Grok, and ChatGPT.
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supertools-browser-toolkit
20+ browser tools in one extension. Calculator, Converter, Color Picker, JSON, Dark Mode, Password Gen & more. 100% offline.
Validate HTML
"Validate HTML" is a powerful Firefox addon designed to streamline the process of validating HTML code directly within the browser. With this addon, users can quickly check their HTML markup for errors and compliance with web standards
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Cart Tracker
Assists healthcare professionals with pharmaceutical data research and information gathering from regulatory websites involving drugs and their prices.
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フォント検出ツール
あらゆるウェブサイトで使われているフォントを検出し、フォントファイルをワンクリックでダウンロードします。
URL Modifier by Gerbil
Rewrite HTTP/HTTPS request URLs using regex rules — before, replace, or after the matched pattern.
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Bunny Inspector
Capture page context (elements, screenshots, console, network) and export to your AI coding assistant for debugging
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W3Dart.com : Audio-Visual bug reporting tool
Dart can be used at almost every stage of the development process. Right from wireframing till maintenance, Dart can prove a highly beneficial tool throughout the entire journey.
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XPath Studio
XPath Studio is a powerful Firefox extension designed for automation testers and QA engineers to capture, analyze, and generate reliable XPath locators and web elements with minimal clicks.
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HTTP Header Network Monitoring
Persistent tab-scoped HTTP monitor with headers, bodies, raw/beautified JSON, blacklist rules, resend, and HAR/JSON exports.
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Easy AI Assistant
Chat with AI directly from your Firefox toolbar. Ask questions, summarize pages, translate text, or get simple explanations using ChatGPT or Gemini—without leaving your current tab.
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Open Graph Checker
Preview and check a page's Open Graph metadata — see how it will look when shared and which tags are missing.
Screen Craft - Full Page Capture
Professional deterministic page capture, vector annotation editor, and PDF compiler.
PseudoChess
A chess learning and analytical tool for chess.com. Stockfish 17.1 analysis, move quality, highlights, openings. Contact: suboticdominik@gmail.com.
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ColorBlind Accessibility Filter
Modify webpage colors to improve accessibility for colorblind individuals
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