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

Log in

14,740 extensions found in Web Development

Filter results
Search results
  • Web Edit

    Web Edit

    Easily edit websites temporarily with a click of a button.

    Ryan Luu

    1,723 users

  • gooreplacer

    gooreplacer

    A browser extension to block/redirect URLs and modify headers

    Jiacai Liu

    1,713 users

  • WebSocket Weasel

    WebSocket Weasel

    A Handy Console / Client to Communicate with WebSocket Servers

    Mor. H. Golkar

    1,702 users

  • Print PDF

    Print PDF

    Print any Webpage to PDF. No server or third-party processing. Uses built-in Firefox converter.

    Senthil Ponnusamy

    1,694 users

  • Website IP

    Website IP

    Simple add-on that displays the current website IP address without a third party service. Converting the current tabs domain name to IPv4 & IPv6 via DNS lookup.

    Liam Stewart

    1,681 users

  • APK Downloader

    APK Downloader

    APK Downloader Direct download apps of the Google apps store without using Google Play.

    Apkgk.com

    1,680 users

  • ChroPath

    ChroPath

    ChroPath helps to generate and validate selectors like relative xpath, cssSelector etc with iframe support.

    AutonomIQ

    1,677 users

  • Try XPath

    Try XPath

    This add-on displays the result of evaluating XPath expression or CSS selector.

    larissa9839

    1,675 users

  • tweak: mock and modify HTTP requests

    tweak: mock and modify HTTP requests

    tweak lets you mock and modify HTTP requests without leaving the browser

    tweak

    1,673 users

  • Extended Color Management

    Extended Color Management
    By Firefox

    Ever wish that Firefox didn't use color management when viewing images or video? Turn it off easily with this add-on.

    Firefox

    1,661 users

  • Image saver

    Image saver

    Save any images in page directly from context menu, this includes svg elements, css background images and direct child images.

    Tom

    1,658 users

  • Xdebug-ext

    Xdebug-ext

    Adds a simple button to inject a Xdebug cookie. Compatible with Firefox 57+ (Quantum). It is a port of "The easiest Xdebug" Addon by Nikita Nikitin, which is not compatible with WebExtensions.

    Loïc HALL

    1,658 users

  • (Animated) Nyan Cat Progress Bar for YouTube™

    (Animated) Nyan Cat Progress Bar for YouTube™

    Nyan Cat Progress Bar for YouTube™ ~~ [Animated] ~~

    Ferris Etanish

    1,653 users

  • Open Graph Preview

    Open Graph Preview

    Shows approximately what users will see if this webpage is shared on websites that uses OG tags to display a preview. Let you detect if no Open Graph Tags are set on your webpage ! The shown preview is inspired from the Facebook one.

    apiaget

    1,644 users

  • HackBar

    HackBar

    A browser extension for Penetration Testing

    0140454

    1,642 users

  • Extension source viewer

    Extension source viewer

    View source code of Firefox add-ons and Chrome extensions (crx/nex/xpi) from addons.mozilla.org, the Chrome Webstore and elsewhere, with CRX Viewer (crxviewer).

    Rob W

    1,624 users

  • Code Injector

    Code Injector

    Inject code into websites! (JavaScript, CSS, HTML and Files)

    Saba

    1,622 users

  • Load Time

    Load Time

    Adds an icon to the address bar to provide load time information of the current page.

    Nobuyuki Honda

    1,615 users

  • DevTools Media Panel

    DevTools Media Panel

    DevTools panel that displays technical details about media elements and webrtc on the current page; intended primarily for web developers to understand media playback issues on their sites, and for users to provide more informative bug reports.

    Karolien Koorts

    1,607 users

  • JSON-formatter

    JSON-formatter

    Fast JSON formatting.

    Alexei Moroz

    1,605 users

  • AWS SSO Containers

    AWS SSO Containers

    Automatically places AWS SSO accounts into containers.

    Joseph Pintozzi

    1,577 users

  • HackTools

    HackTools

    Hacktools, is a web extension facilitating your web application penetration tests, it includes cheat sheets as well as all the tools used during a test such as XSS payloads, Reverse shells to test your web application.

    Riadh B. & Ludovic C.

    1,576 users

  • The Tab Suspender

    The Tab Suspender

    Suspends inactive tabs after a set time by replacing them with a custom suspended page.

    Faisal Bhuiyan

    1,572 users

  • HighlightAll

    HighlightAll

    Automatically highlight and count all occurrences of a word by selecting it. Custom mode option provides multiple highlighting feature with customizable colors and can also display search markers beside the scrollbar.

    Jerome Goudey

    1,571 users

  • Test & Feedback

    Test & Feedback

    Now everyone on the team can own quality. Capture findings, create issues, and collaborate with the team, directly from the browser.

    Microsoft Corporation

    1,566 users