To use these add-ons, you'll need to download Firefox.

Log in

11,510 extensions found in Web Development

Filter results
Search results
  • Media Extractor Pro

    Media Extractor Pro

    Extracts all .mp4 files from a webpage.

    Alice Sn0w

    169 users

  • Dom Tree and CSS Playground

    Dom Tree and CSS Playground

    On ANY web site, easily find/edit the web elements and styles that you need, in real time. Use css playground to micro-view 100's of styles in seconds. NOTE: Use your shortcut key "f" allot.

    Jody Brabec

    168 users

  • Font Detect

    Font Detect

    The font-detect extension is a browser add-on that allows users to easily inspect and verify font styles applied to elements when they hover over them on webpages.

    Bozidar Atanasovski

    168 users

  • Plain Text Linker

    Plain Text Linker

    Opens plain text URLs when you double-click on them.

    Marnes

    168 users

  • CoreTax PDF Downloader

    CoreTax PDF Downloader

    Unduh PDF massal dari CoreTax dengan API langsung. Tanpa refresh atau klik satu per satu.

    Mabaega

    168 users

  • Javascript Control

    Javascript Control

    Add a button in the url bar to block or enable javascript per-site. Default is javascript disabled.

    Erwan Ameil

    167 users

  • DNSC Blacklist Protection

    DNSC Blacklist Protection

    Protejează-te împotriva domeniilor periculoase folosind baza de date DNSC.

    DNSC | DGOT

    167 users

  • Close Similar Tabs

    Close Similar Tabs

    Close similar tabs with this lightweight and simple extension.

    SY-dev

    166 users

  • Public IP Display

    Public IP Display

    Displays your IP address and country using lookup services of your choice. Auto-refreshes, notifies, and displays.

    Marnes

    165 users

  • Text to Speech

    Text to Speech

    Read any selected text in the browser with human-quality text-to-speech (TTS) engines

    Brian

    164 users

  • Last Tab

    Last Tab

    Allows you to switch to the last or most recent tab, Press Alt + Z You can also change the keyboard shortcut following this link https://support.mozilla.org/en-US/kb/manage-extension-shortcuts-firefox

    Mehedi Hasan

    164 users

  • Show-HTTP-Headers

    Show-HTTP-Headers

    Show HTTP headers in each tab.

    Warren Bank

    164 users

  • SecurityHeaders.io Analyser

    SecurityHeaders.io Analyser

    Click to show the score for the current page. Click again to show the full report on our site.

    Scott Helme

    163 users

  • JsonDiscovery

    JsonDiscovery

    Browser extension that changes the way you're viewing JSON

    exdis

    163 users

  • Browser History Export

    Browser History Export

    Export your browser history in an safe format.

    Dries Depoorter

    162 users

  • Disable WebP Images

    Disable WebP Images

    Disables WebP images by removing image/webp from Accept header

    John Galt

    162 users

  • Postwoman 中文版 - REQRES.CN

    Postwoman 中文版 - REQRES.CN

    为使用 Postwoman Web 版应用程序提供更好的体验。 你没用过 Postwoman 吗？这可是一个惊人的，免费、快速、漂亮的 API 测试请求工具。 请访问 https://reqres.cn/

    xlstudio

    162 users

  • Lizard

    Lizard

    Select and remove annoying or unnecessary elements from a page. Great for printing and readability.

    arielg

    161 users

  • GrowthBook DevTools

    GrowthBook DevTools

    GrowthBook DevTools helps you debug feature flags and experiments and design A/B tests visually — all from your browser.

    GrowthBook

    161 users

  • Search with ChatGPT powered by OpenAI!

    Search with ChatGPT powered by OpenAI!

    Adds a ChatGPT search engine. 'gpt' to start ChatGPT thread.

    zavage

    160 users

  • Copy image as Base64

    Copy image as Base64

    Allows you to copy an image to clipboard in a Base64 format data URI

    Syd Lambert

    160 users

  • Wide GitHub

    Wide GitHub

    Change all GitHub repository and gist pages to be full width and dynamically sized.

    xthexder

    160 users

  • Semrush Website SEO Tools

    Semrush Website SEO Tools

    The Semrush Website SEO Tools extension for Firefox offers a range of tools to help improve your website's SEO performance. With features for on-page SEO analysis, keyword research, backlink checking, and more.

    PapiTekno

    159 users

  • FancyTracker-FF

    FancyTracker-FF

    A browser extension for monitoring and analyzing PostMessages and listeners in web pages.

    Erik Zettergren

    159 users

  • Math in Address Bar

    Math in Address Bar

    Solve math equations in the address bar by typing 'math', then an empty space, then an equation like '(3^2 + 4^2)^(1/2)' and the answer will appear in the drop down menu.

    em_te

    158 users