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If you want to edit an existing chrome extension, it is very easy!
There are many reasons why someone might want to do this, perhaps to enable a pay only option, perhaps to remove some of the tracking elements extension designers add in.
Chrome extensions are written in javascript and each file gets a MD5 signature that chrome checks before it runs the extension.
If you don’t bypass this check, then Chrome will disable the extension thinking it is corrupted.

First, you wan to find the extension folder, on windows it is
C:\Users\\AppData\Local\Google\Chrome\User Data\Default\Extensions

Here is a Stackoverflow link that discusses the path for other OSes

Now copy this folder somewhere else, like in your `code` or `workspace` dirs.
Now go to chrome://extensions/ and enable developer mode.
Now load ‘unpacked extension’
Everytime you make a change to your extension, just go back to chrome://extensions/ and reload the extension to see your changes.

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