Custom Site JS

Run your own (per url or domain) custom JavaScript on sites.
What is Custom Site JS?
Custom Site JS is a Chrome extension that allows you to add, edit, or delete snippets of custom JavaScript to be automatically run on websites based on specific URLs. It provides an easy way to personalize your browsing experience without any external information sharing.

Extension stats

Users: 124 ▲ 8
Rating: 5.00 (1)
Version: 1.0.2 (Last updated: 2024-10-26)
Creation date: 2019-10-28
Risk impact: High risk impact
Risk likelihood: Moderate risk likelihood
Manifest version: 3
Permissions:
  • webNavigation
  • storage
  • tabs
  • *://*/*
Size: 96.91K

Other platforms

Custom Site JS (v1.0.1)
4.60 (5) 297
Not available on Edge
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Extension summary

Have you ever wished you could customize a website to your personal preferences every time you visited it?

Ever heard of a bookmarklet? Bookmarklets run JavaScript on a page for you when you click on the bookmark. But how inconvenient to have to click a bookmark every time you visit a site?

What if you could have your JavaScript simply run on the site as the page loads with no extra effort from you? That's what this extension is about.

Custom Site JS allows you to Add, Edit, or Delete snippets of custom JavaScript, that will automatically be run on a page for you based on a URL you provide. You can create as many as you like. The only limit is a maximum of 5 megabytes as the scripts are stored in your local storage.

Everything is stored and run locally. This extension will never make any kind of external web request, network requests, or in short send any of your information anywhere. The only way it will pass any information outside of your local environment is if you create a snippet of JavaScript that explicitly sends information somewhere.

User reviews

now i can auto expand self text posts on reddit instead of clicking on a bookmarklet. So, i can hide the bookmark toolbar now. Make sure scroll to right in addon textbox to check "Enable on".
by Zedroid, 2024-03-01
View all user reviews

Extension safety

Risk impact

Custom Site JS requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk likelihood

Custom Site JS is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this extension.

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