[thefisola]

I might be misinterpreting your question but I'll try to explain further, hopefully it makes sense:

So the way most email cleaning tools work is:

- Scan your emails for all your subscriptions - via Gmail API - Each subscription has a link, that link is what is used to unsubscribe the link can either be in the email header or email body - This can be a POST request or a GET request, in some complex cases a mail send to unsubscribe - With this link for each mailing list, mass unsubscription can happen

So the main difference here is, other tools do this on the third-party servers. InboxPurge does this on your browser/device (specifically the email scanning bit). Making HTTP requests to the Gmail API from your device.

Yes, it's also possible to build a browser extension that does this on a third-party server.

*Other things happen depending on the email cleaning tool but I've tried to simplify to explain better.

Hope it was helpful.

You can find the list of browser permissions a Chrome extension can request for here: https://developer.chrome.com/docs/extensions/reference/manif...