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How to check that an add-on doesn't spy on you ?
(sh.itjust.works)
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But wouldn't that just tell you, "Firefox was connecting to the internet"?
Nope, it'd give details. Combing through and decrypting those details is another matter, though.
You can MITM yourself and setup your own CA, no?
If you so chose to, yep.
No, it would say which packet is being sent to which destination.