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I would pay money for an extension that keeps track on datatraffic of other installed extension and creates firewall rules (or something equivalent) based on my permission/deny. (I know that this is the other way around, but apparantly chrome isn't fixing these data issues...)

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While I only have limited experience writing extensions, this seems doable.

You can most definitely add a hook for every outgoing request, though I'm not sure if the browser lets you know the origin of the request, i.e. the browser window or an extension.

If it could, at the most basic level it could write outgoing data to a log file.

AFAIK this is not possible. I don't think you can block request made by other extensions. I assume the API you were referring to is https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...

I wasn't sure if you could identify the origin of the request, I guess it makes sense that would not be possible or it could end up being cat and mouse between extensions.

For me specifically I had done some work with Firefox extensions, pre-quantum.

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