Turns out Firefox has a similar issue, despite mitigations :( https://bugzilla.mozilla.org/show_bug.cgi?id=1372288
replyThis only happens if the extension puts their `moz-extension://` links into the DOM. It's different to chrome case where extensions can be detected regardless of being activated on that site or not.
replyAs I understand it, an extension could also leak its links via its own backend, e.g. to advertisers, who could then detect it even though no user-observable DOM modification is happening.
replyMuch better than static global IDs, but still not ideal.
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