This extension allows you to inject any javascript code into the web page you are visiting. It remembers your page specific script and syncs it across all your devices. For example, if you want to change the background color of https://duckduckgo.com/ with light blue, you can inject the script document.body.style.backgroundColor = 'lightblue'; using this extension. After that every time you open this web site, the back ground will be light blue automatically.
You can Follow the below Step By Step procedure to install the Javascript Injector Chrome Extension to your Chrome Web browser.
It is the Javascript Injector Chrome extension download link you can download and install Chrome Browser.
An easily way to turn ON/OFF website's JavaScript
Inject your Javascript into the webpage
User JavaScript and CSS on any website
Run custom JavaScript on any website.
Inject jQuery into all frames on any page.