Run custom JavaScript on any website.

Latest Version

Version
3.4.12
Update
February 20, 2023
Size
588KiB
Developer
Category
Users
50,000+
Rating
4.3876 ★
Manifest Version
2
Web Store Status
Languages Support
English
See more
Permissions
Storage
Http://*/
Https://*/
Tabs
See more

Custom JavaScript for Websites 2 Extension

Run custom JavaScript on any website. Use this tool to inject custom JavaScript in any website.

Your scripts are kept by the Chrome sync API and applied across domain URLs. You can inject custom JavaScript based on domain or custom Regular Expression (since v3.1.1).

This extension supports dedicated tab to edit your codes since v2.5.1

You can use some built-in libraries such as
* jQuery 1.12.4
* jQuery 2.2.4
* jQuery 3.2.1
* Indefinite Observable 1.0.1
* MooTools 1.6.0

or/and your own external scripts.

Use cases:

* Site debugging (wrong list sort, etc.)
* Extract useful information from website, such as billings/orders metadata
* Hide annoying popups and Ads
* Custom UI
* Anything you can think of :)

Inject large JavaScript: https://github.com/xcv58/Custom-JavaScript-for-Websites-2#how-do-i-inject-large-javascript

New features:

Ace Editor (formating, highlight, undo/redo by hotkeys)
Draft auto save (so doesn't matter when you close the window without saving)
Hosts (websites) switch (you can browse customjs of other websites)
Include external script (eq. Underscore.js is cool)
Thanks to:

Ace - http://ace.c9.io/
Pure - http://purecss.io/
Read more

Source Manifest.json

{
"update_url": "https://clients2.google.com/service/update2/crx",
"description":"Run custom JavaScript on any website.",
"version":"3.4.12",
"manifest_version":2,
"name":"Custom JavaScript for Websites 2",
"short_name":"customjs",
"author":"xcv58",
"minimum_chrome_version":"52.0.2743",
"icons":{"16":"icon-16.png",
"19":"icon-19.png",
"32":"icon-32.png",
"38":"icon-38.png",
"48":"icon-48.png",
"128":"icon-128.png"},
"background":{"scripts":["background.js"],
"persistent":false},
"content_scripts":[{"all_frames":true,
"js":["run.js"],
"matches":[""]}],
"web_accessible_resources":["*.css",
"base.js"],
"browser_action":{"default_icon":"icon-48.png",
"default_popup":"popup.html"},
"content_security_policy":"script-src 'self' 'unsafe-eval' https://*.googleapis.com https://gitcdn.link https://cdnjs.cloudflare.com; object-src 'self'",
"permissions":["storage",
"http://*/",
"https://*/",
"tabs"]}
Read more

How to download and manually install Custom JavaScript for Websites 2 extension for Chrome

Looking for a way to install Custom JavaScript for Websites 2 extensions for Chrome, you can search for them in the Chrome Web Store, clicking the "Add to Chrome" button, and following the straightforward process.

However, you may need to install Custom JavaScript for Websites 2 extensions manually, this article outlines two simple methods to effortlessly install Custom JavaScript for Websites 2 extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download Custom JavaScript for Websites 2 extension and manually install through Drag &Drop

If you ever need to manually install a Custom JavaScript for Websites 2 extension for Chrome, don't worry, it's a simple process. Just follow these easy steps, and you will have your extension ready to use in no time.

Step 1: Download the Custom JavaScript for Websites 2 Extension by clicking the "Download CRX" button on the website.

Look for the Custom JavaScript for Websites 2 extension you wish to install. Go to the website and download the Custom JavaScript for Websites 2 extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for Custom JavaScript for Websites 2 extension that contains all the data.

Step 2: Extract &Arrange Files

Once the file is downloaded, extract that file into its own folder. Similarly, give that extension files a permanent home. In other words, keep it in a folder that you don't accidentally delete it because these files will be needed to make that extension work.

Step 3: Go to the Chrome Extensions Page

Open Google Chrome and in the address bar, type chrome://extensions; it will open the Google Chrome extensions page. Make sure that "My extensions" is selected in the sidebar.

Step 4: Drag and Drop the Extension

Now, go to the folder where you extracted the Custom JavaScript for Websites 2 extension and drag &drop the extension file from there anywhere onto the extension page within Google Chrome.

Step 5: Complete the Installation

Once you drag and drop the extension file, follow the steps that Google Chrome takes you through. Similarly, if the extension file is of .crx file format, you will be required to review the permissions and then add the extension.

Now, you can manage that added extension as you would like to with any other Chrome extension that you added through Chrome Webstore. Its icon will also appear in the Google Chrome Menu on the right side of the address bar once you activate it.

Method 2: Download Custom JavaScript for Websites 2 extension for Chrome and install in Developer Mode

This is another method to install Custom JavaScript for Websites 2 extension manually, but the twist is that here, you install by enabling the developer mode option provided in Google Chrome. This mode is commonly used for testing extensions or running unpublished tools.

Step 1: Download the Custom JavaScript for Websites 2 extension file

Select and download the Custom JavaScript for Websites 2 extension by clicking the 'Download CRX' button on the website.

Step 2: Extract the downloaded contents

Convert the file to a ZIP file if it is in CRX format then extract the Custom JavaScript for Websites 2 extension zip file or folder that you downloaded. Make sure you extract it using the same folder name and keep it safely in another folder, so you don't delete it by mistake. The extracted folder will be needed to keep your Custom JavaScript for Websites 2 extension running.

Step 3: Open Chrome Extension Setting Page

In the address bar of Google Chrome, type chrome://extensions and open the Chrome Extension Page.

Step 4: Enable Developer Mode

After opening the Chrome Extension page, look at the top right side, and you will find the toggle option of "Developer mode."Simply enable that developer mode option.

Step 5: Load the Unpacked Extension

Once you enable the developer mode option, you will see the menu of Load Unpacked, Pack Extensions and Update. From that, select the option "Load unpacked."

Step 6: Select the Extension Folder

Once the pop-up opens upon clicking Load unpacked, select the Custom JavaScript for Websites 2 extension directory and click on the "Select Folder "button.

Step 7: Confirm and Install

After you select an extension folder of a Google Chrome extension you're installing manually, confirm its installation for the final time and let the installation complete.

Conclusion

Here we've made a step-by-step guide on How to manually install Custom JavaScript for Websites 2 extension in 2 ways. We hope this guide proves helpful.

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User reviews

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Николай Друг (NickIAm) (ID: 000000be17541def) Voted 5 ★ - Updated 10/26/2023 It's an insane extension that I cannot live without. It made my life so much easier on so many websites!

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Anshu kumar (ID: 0000003b52bfd3fc) Voted 5 ★ - Updated 09/20/2023 love it

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Nathi Nonthasen (ID: 000000563b3f9f35) Voted 4 ★ - Updated 08/22/2023 Please allow more code size, import & export.

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Ramit Bhalla (ID: 0000004750f2f884) Voted 4 ★ - Updated 03/23/2023 Awesome plugin, wish it had an option to run a script automatically when the page loads instead of having to open and click save each time

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Hatem Badawi (ID: 000000f799eed600) Voted 5 ★ - Updated 02/08/2023 magical