Run Custom Javascript and CSS in a Webpage using this Chrome Extension

All you need to do is to add the host rule with your custom javascript or css code in the popup. You can also set the popup window in the extension page.

After a title has been set, edit the rule to paste in your own javascript code and/or css code and/or add 3rd party library url

The popup will appear on the webpage you have configured.

Paste the javascript and/or css code, 

Flip the switch to allow the javascript or css to run (either at popup or in the extension options page)

After the url has been refreshed, you can see your code has been applied.

This is an easy-to-use tool for running custom javascript and css in a webpage with ease.