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Run custom Javascript, each time you visit a website ⚡ Run custom JavaScript on any website — automatically, every time you visit. Save your scripts per domain. They execute on page load, every single time. No setup, no config files, no extra tools. Just your code running where you want it. 1. Visit any website 2. Click the Run JavaScript icon 3. Write or paste your custom JavaScript code 4. Save — your script auto-runs on every future visit to that domain Toggle scripts on/off per site with one click. Scripts persist across browser restarts. 🎯 WHAT YOU CAN DO ✅ Remove ads, popups, banners, cookie notices, and distracting elements ✅ Inject custom CSS — dark mode, custom themes, font changes, layout fixes ✅ Auto-fill forms, pre-select dropdowns, auto-click buttons ✅ Auto-run scripts on page load without manual intervention ✅ Extract data, scrape content, highlight information on any page ✅ Add features websites are missing — keyboard shortcuts, UI tweaks ✅ Automate repetitive tasks — clicks, form submissions, navigation ✅ Inject custom HTML elements, dashboards, or productivity widgets ✅ Test and prototype frontend code changes on live websites ✅ Debug and inspect page behavior with custom console scripts ✅ Modify DOM elements, rewrite page content, restructure layouts 💻 BUILT FOR DEVELOPERS ✅ Ace code editor with full syntax highlighting and auto-indent ✅ jQuery library included (1.12.4, 2.2.4, 3.3.1) — or use vanilla JavaScript ✅ Execute button for instant testing before saving ✅ Scripts stored per hostname using Chrome storage API ✅ One-click enable/disable toggle per domain ✅ Works on all http and https pages ✅ Manifest V3 — secure, fast, modern Chrome extension architecture ✅ Service worker background script — no performance overhead ✅ Sandboxed execution with duplicate run prevention → Web developers testing and debugging on production sites → Frontend engineers prototyping UI changes live → QA testers injecting test scripts and automation → Digital marketers running A/B tests and analytics scripts → Power users customizing websites to fit their workflow → Students learning JavaScript with real-world web pages → Automation enthusiasts replacing repetitive manual tasks → No data collection, no tracking, no analytics → No account required — works immediately after install → All scripts stored locally in your browser → Open source and transparent → Manifest V3 security standards → No external network requests Lightweight. Fast. Private. Just your JavaScript, running where you want it. Install now → click the icon → paste your code → done.
Javascript Chrome
Quickly disable/enable JavaScript for the Chrome browser in 1 click. Works on any website. ❗❗❗ After installation, pin the extension to the Google Chrome panel as shown in the screenshot: 1. Click on the extensions icon (looks like a square). 2. Find the JavaScript Chrome extension and click on the "Pin" icon. ❗❗❗ 🔥 Introducing the Javascript Chrome extension, your go-to solution for swift JavaScript control on the Chrome browser. With just one click, you can seamlessly disable or enable js, providing unparalleled convenience on any website. 💪 Experience the power of Javascript Chrome, the ultimate tool for efficient management. Toggle js settings with ease, empowering you to debug webpages, check code errors, and enhance your overall browsing experience. Install Javascript Chrome today, and let us handle the rest. ✅ Easy Install: Get started hassle-free with a simple installation process that takes seconds. ✅ Quick Use: Experience instant control with a swift, one-click toggle for JavaScript preferences. ✅ You Will Like It: Embrace a user-friendly interface and a seamless browsing experience that you're sure to enjoy. ✅ My Friends Using It: Join a community of satisfied users as your friends already trust and use Javascript Chrome. ✅ One Simple Thing: This extension focuses on doing one thing exceptionally well – providing quick and efficient control for a tailored browsing experience. 🕹️ On any given Chrome tab, a single click on the Javascript for Chrome extension icon is all it takes to enable or disable js. It's the quickest and most straightforward way to take control of your preferences with ease. 🔄 Javascript Chrome - Say goodbye to complex settings and tedious navigation. Once installed, this extension becomes your reliable companion, ready to serve whenever you need to manage JavaScript on any website. Click on the Javascript Chrome icon when you want to disable it for a specific site, and click again to re-enable it. 🌐 The simplicity of our extension makes it the preferred choice for users who value a hassle-free browsing experience. Install the extension, and you'll find yourself effortlessly toggling JavaScript on or off in no time. 🎉 With Javascript Chrome, the name speaks for itself. Take advantage of the quick and easy control it provides, ensuring a seamless experience on the Chrome browser. Trust in Javascript Chrome for reliable JavaScript management on any website, and enjoy the freedom to customize your browsing environment. 🌈 Don't settle for complicated solutions. Choose Javascript Chrome for a straightforward, one-click solution to enable or disable JavaScript on the Chrome browser. Elevate your browsing experience today! Javascript for Chrome, the name you'll be clicking on again and again for effortless js control.
Page Manipulator
Inject HTML, CSS or JavaScript into any web-page. The changes you make are applied every time you visit the specified website(s). - Automatically inject custom HTML, CSS, and/or JavaScript into the pages you specify. - Run custom CSS before the page is fully loaded so you won't see the original page first. - Inject JavaScript on the go. - Add/Remove/Change the HTML and CSS on the go. - Right click on any element on a page to get the full CSS path. - Automatically saves the changes you make. - Files that contain less than 8000 characters are synced across your Google account. - Files that contain 8000 or more characters are stored locally. - Cheat simple games like the T. rex game. - Make your own dark-theme for any website. - Test a website you're working on. - Whatever you can imagine, be creative ;) - Simple, First open the extension. - Choose 'JavaScript', 'CSS' or 'HTML'. - Create a new file by pressing 'new'. - Write your own code or get some from the examples here: https://github.com/Ruud14/Page-Manipulator/tree/master/examples - Press the 'manipulate' button to test your code. - To make sure your code is run every time you visit a specific page do the following: - Put the URLs of the websites in the 'active websites' input. - Check the 'active' checkbox. - Button functionalities: - The 'Reload' Button: - Will Reload the current page. - The 'Active' checkbox: - on > The code will be run automatically on the pages specified in the 'Active websites' textarea. - off > The code will only run when you press the 'Manipulate' button. - The 'Active Websites' textarea: - You can specify the websites you want your code to run on here. - The 'Matching Pages' dropdown: - 'Exact' > The code will only run when the URL of the page is exactly the same as one of the URLs in the 'Active Websites' textarea. (Including slashes at the end!) - 'Recursive' > The code will also run on all sub-pages of the specified URLs in the 'Active Websites'. - The 'Position on page' dropdown (only with HTML): - 'Top' > The HTML will be added to the top of the page. - 'Bottom' > The HTML will be added to the bottom of the page. - 'Replace' > The HTML will replace the entire body HTML of the page. - The 'Manipulate' or 'Update Manip.' button: - Injects the code into the page or updates the injection. - **This button also works when the 'Active' checkbox is unchecked.** - The 'Remove Manip.' Button: - Removes the manipulation from the page. - If the "Auto ⟳" checkbox is checked, the page will automatically reload after pressing the 'Remove Manip.' button. The 'active' checkbox will also be unchecked. - The 'Delete' button: - Deletes the current file from the storage. - You can right-click any element on a page to get the CSS path of that element. - If the extension button in the top right corner is greyed-out, you can't use it on that page. - Make sure the 'active' checkbox is checked. And the 'active websites' input contains the correct URLs. - For JavaScript: - Make sure your code is run at the right moment. Maybe try adding a delay. - Check the browser console for error messages. - For CSS: - Make sure you are manipulating the right element by using "inspect element". - Try using '!important'. - For HTML: - Make sure you haven't accidentally set the 'position' dropdown to the wrong position. - Removing and updating JavaScript manipulations might not work the way you expect it to. Removing your JavaScript manipulation from a page only removes the element, so dynamic changes made to the page will stay there even when you remove the manipulation. To completely remove everything the manipulation did, you must reload the page. This extension works on most sites, but there are some exceptions! If you'd like to see any specific improvements or found any bugs, let me know here: https://github.com/Ruud14/Page-Manipulator/issues The editor I used since release v0.2.0-alpha is Ace editor. Check it out here: https://ace.c9.io/
Custom Style Script
Add Custom JavaScript (JS) Code or Styles (CSS) to any page. Custom Style Script customizes the way a webpage looks or behaves, by adding a small JavaScript or CSS code. You can also specify a URL to add the code or add it to all pages. Key features: 1. Add custom JavaScript codes or styles (CSS) to a specific page or all pages. 2. Clicking on the toolbar icon allows you to disable or enable the addon. 3. Each code item has several options to adjust (see options page for details). 4. You can add several code items and active or inactive them separately. 5. An example of how to add a code is available in the add-on's options page. 6. Before adding the code (JS or CSS) please make sure you have validated the code. 7. Online JS or CSS links (i.e. jQuery or bootstrap) can also be added to any page. See add-on's options page for details. Note: to report bugs, or request a feature, please visit the add-on's homepage (https://mybrowseraddon.com/custom-style-script.html) and fill the bug report form.
Chrome extension source viewer
View source code of Chrome extensions, Firefox addons or Opera extensions (crx/nex/xpi) from the Chrome web store and elsewhere. View the source code of any Chrome extension in the Chrome Web store without installing it. Features: - Button at the Chrome Web store - Download extension as zip file - View source - Configurable via context menu on button: Set one-click action via "primary action on click". - View source: - File name/type filter - Search in the file content (literal or regexp) - Automatic beautification (formatting) of code - Syntax highlighting - Show hashes (md5, sha1, sha256, sha384, sha512) of individual files - Image preview - View embedded zip files - View any zip file by URL or file chooser - View source of platform-specific extensions (such as Chrome OS-only extensions, or NaCl for a different architecture). - Permalink to file and search result within a zip or extension file. - Full support for incognito mode. - Outputs public key and extension ID to the console. Optional features (see options page): - View source of Opera 15+ extensions, Edge extensions, Firefox addons or Thunderbird add-ons. - "View extension source" contextmenu item on links to Chrome extensions - View source of Chrome extensions outside the webstore. The View source button becomes visible when you select a CRX file for download. Change log: - 1.2.3: Add "downloads" permission to make sure that the "Download" button always works as intended. - 1.2.4: Add extra parameters to the CRX URL to make sure that CRX files of extensions uploaded to the Chrome Web Store after July 2014 are correctly read. - 1.2.6: Sync options, use optionsV2, show numeric progress instead of dots, updated JSBeautifier, restore font size. - 1.2.7: Bugfixes (viewer height, checkbox filter). - 1.3: Support Firefox addons (also available as a Firefox addon!) Search within files Customize webstore download parameters View embedded zip files and any zip file - 1.3.1: Use correct URL for loading extension files. - 1.3.2: Bugfix to allow unusual extension URLs to be opened again. - 1.4: New syntax highlighter, improved search controls, improved word wrap. - 1.5: Calculate hashes, add link to Github project page, bugfix for case-sensitive search. - 1.6: Improved search highlighting & also search in beautified content. - 1.6.2: Configurable "primary action on click", open new tab next to current tab. - 1.6.4: Support the new CRX3 Chrome extension file format (#62). - 1.6.6: Permalink support, Firefox add-on finder. - 1.6.7: Fix broken extension due to bug with storage access and NativeCrxBindings. - 1.6.8: Support CRX3 file format from CWS; support some other AMO domains. - 1.6.9: Add option to add the context menu item to more links (#69), open new tabs via context menu next to current tab. - 1.6.10: Improve syntax highlighting (perf, highlighting of WebAssembly source), show sum of file sizes. - 1.6.11: Add "Extension ID" row at Analysis of manifest.json, improve CRX3 public key detection, improve zip fallback detection. - 1.6.12: Support source viewing of Edge and Thunderbird extensions, recognize CRX3 from Opera, update beautifier. - 1.6.13: Work around Chrome bug that broke the extension button (#120). - 1.7.0: Support new Chrome Web Store (#134), and migrate to Manifest Version 3.
