Open Source Browser Extensions and Plugins

Browse free open source Browser Extensions and Plugins and projects for Windows and Android below. Use the toggles on the left to filter open source Browser Extensions and Plugins by OS, license, language, programming language, and project status.

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  • 1
    FastClick

    FastClick

    Easy-to-use library to remove click delays on browsers with touch UIs

    FastClick is a simple, easy-to-use library for eliminating the 300ms delay between a physical tap and the firing of a click event on mobile browsers. The aim is to make your application feel less laggy and more responsive while avoiding any interference with your current logic. FastClick is developed by FT Labs, part of the Financial Times. Note: As of late 2015 most mobile browsers - notably Chrome and Safari - no longer have a 300ms touch delay, so fastclick offers no benefit on newer browsers, and risks introducing bugs into your application. Consider carefully whether you really need to use it. The library has been deployed as part of the FT Web App. FastClick doesn't attach any listeners on desktop browsers.
    Downloads: 7 This Week
    Last Update:
    See Project
  • 2
    hosts

    hosts

    Consolidate and extend hosts files from several well-curated sources

    Consolidating and extending hosts files from several well-curated sources. You can optionally pick extensions to block pornography, social media, and other categories. The unified hosts file is optionally extensible. Extensions are used to include domains by category. Currently, we offer the following categories: fakenews, social, gambling, and porn. Extensions are optional, and can be combined in various ways with the base hosts file. The combined products are stored in the alternates folder. Data for extensions are stored in the extensions folder. You manage extensions by curating this folder tree, where you will find the data for fakenews, social, gambling, and porn extension data that we maintain and provide for you. Create an optional blacklist file. The contents of this file (containing a listing of additional domains in hosts file format) are appended to the unified hosts file during the update process. A sample blacklist is included, and may be modified as you need.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 3
    XML Viewer Plus

    XML Viewer Plus

    A powerful XML Viewer - add-on for browser Firefox

    A powerful XML Viewer, supports text/regex and jQuery/CSS, XPath selectors ==== Release 1.2.6 - 17.06.2019 - Added utf-8 encode for xml viewer ==== Get your XML Editor and Validator on Play Store > https://play.google.com/store/apps/details?id=com.ulm.xmleditor ==== ## Libraries and techs used 1. `Vue` 2. `Vuex` 3. `lodash/debounce` 4. `jQuery` 5. `document.querySelectorAll` 6. `document.evaluate` for `XPath` 7. `bestzip` for packaging ### Limitations - WebExtension only works on sites that allow content scripts.
    Downloads: 16 This Week
    Last Update:
    See Project
  • 4
    pinvault-pro-extension

    pinvault-pro-extension

    AI-powered browser extension for bulk downloading Pinterest images wit

    PinVault Pro is a professional-grade browser extension that revolutionizes Pinterest image downloading with AI-powered technology. The extension provides intelligent bulk selection, auto-scroll functionality, and maintains HD quality downloads while respecting Pinterest's terms of service. 🎯 Core Features: • Visual checkbox overlays on Pinterest images for intuitive selection • AI-powered auto-scroll with smart content detection • Bulk download capabilities with real-time progress tracking • HD quality preservation in original resolution • Modern glassmorphism interface design • Privacy-focused architecture with no external servers • Cross-browser compatibility (Firefox, Chrome, Edge, Opera) • Real-time synchronization between popup and sidebar interfaces 🌍 Universal Browser Support: • Firefox: Official Mozilla Add-ons Store approval (61.4 KB package) • Chrome/Edge: Manifest V3 compatible (60.0 KB package) • Opera: Manifest V3 compatible (60.3 KB package)
    Downloads: 6 This Week
    Last Update:
    See Project
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  • 5
    MeanOS

    MeanOS

    The smallest and the most powerful operating system.

    The first decentralized, artificially intelligent, MEAN.js stack, operating system. Mean OS is the only operating system hosted anonymous using a P2P network and a suite of non-standard in-browser delivery mechanisms. Mean OS is specifically designed to support both Brave and Tor but is compatible with all other major browsers. Mean OS is Proud to be a BRAVE and TOR supporter, be free!!
    Downloads: 4 This Week
    Last Update:
    See Project
  • 6
    CSS Injector

    CSS Injector

    Rapidly edit custom style of webpage

    ## CSS Injector is a browser extension for web designer to easily inject any CSS code into any webpage or website. ## Use it to tweak and fix website CSS #### It automatically saves your CSS code with local storage APIs ### Limitations - WebExtension only works on sites that allow content scripts.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 7
    A11yWidget

    A11yWidget

    Accessibility Toolbox

    ## Accessibility Widget - v0.3 It is a simple accessibility add-on for browser Firefox without dependencies that allows users with disabilities easy and convenient way to browse most websites ### Supported Languages English by default, Hebrew and Russian. These languages ​​are auto-detected by the browser ### Future implementations - Option page to set position of widget and I hope many other interesting components...
    Downloads: 1 This Week
    Last Update:
    See Project
  • 8
    Relative XPath Assistant

    Relative XPath Assistant

    Just right click on the html elements to compare them

    This WebExtension will give you the relative XPath expression of two web elements Release 1.4.2 (04/08/2022) - Adding control key functionality Add-on is based on relative-xpath-helper open-source project on github [https://github.com/syamsasi99/relative-xpath-helper] ### Details - Compared to the original version, some incompatibilities of the scripts with the Firefox browser have been improved and fixed - No data is sent to any server and not get from any server ### Limitations - WebExtension only works on sites that allow content scripts. - Add-on does not search through view-source code of webpage.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 9
    Instant Ad-Close Add-on

    Instant Ad-Close Add-on

    Simple interface for advertising blocking via the webRequest APIs

    Simple but powerful ad-blocking extension for your Browser; the main goals are simplicity of implementation and performance. --- Release 0.6.0 - Added some useful scripts on the web page to improve the security of links and forms --- Once installed, an icon should appear in your toolbar. Red means blocking is enabled, dark grey means disabled; click the icon to toggle. Preferences to customize the URI filters it uses. Details ------- This extension can only block external requests (images, Flash, XHR) via the URL patterns that you can set in the extension's preferences. It won't remove ad content that is part of the actual text of the HTML page. Through the extension options settings you also can hide private addresses from WebRTC/ICE/STUN. ========= To run and build browser extension from cmd or terminal type: - npm install --global web-ext - cd my/path/folder/InstantAd-Close - web-ext run to debug - web-ext build to make add-on
    Downloads: 0 This Week
    Last Update:
    See Project
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  • 10
    MvvmCross Plugins WebBrowser

    MvvmCross Plugins WebBrowser

    Provides a cross-platform UI for displaying the web page

    A MvvmCross plugin that simplifies opening and managing web browsers within cross-platform applications.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 11
    Outline Sidebar

    Outline Sidebar

    Creates table of contents in the sidebar

    Outline is a Firefox WebExtension that outlines the page. To install add-on follow this link - https://mzl.la/2RSwScT Also is available as Cloudflare App - https://www.cloudflare.com/apps/outline-tool It generates a table of contents by extracting all the headings in the page. Automatically creates table of contents in the sidebar that can be clicked through, for easy document navigation. How to use ---- 1. Click the Outline button beside your address bar to activate it. You will see a box coming from left with the outline in it. 2. Click on any of the headings in the outline to jump to the corresponding section on the page. 3. Click the cross button on the bottom left to close the outline. ### Limitations - WebExtension only works on sites that allow content scripts.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    RESTBolt

    RESTBolt

    Browser WebExtension to work on http(s) requests

    ## Inspired by POSTMAN browser extension Add-on is based on [RESTMan](https://github.com/jsargiot/restman) Opera extension --- #### Note - Use a simple HTTP Request & Response Service to test WebExtension
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13
    MobiDevTools

    MobiDevTools

    A mobile devtools for debugging web sites and web apps

    This add-on provides an intuitive and visually appealing panel interface embedded directly inside your Firefox browser. Whether you develop for mobile or desktop web, gain instant access to critical page data and performance metrics — all without leaving the browser or resorting to external tools. »`Click the WebExtension's icon in the toolbar or menu to open the overlay.`
    Downloads: 3 This Week
    Last Update:
    See Project
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