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Re:Firefox Test Pilot by amake on Wednesday May 11, 2016 @01:39AM (#11672848)
Did you actually read and understand his comment?

> I don't run any.

You don't have to. The existence of extensions creates constraints on how they evolve the browser's internals.

Re:Firefox Test Pilot by rhelmer on Wednesday May 11, 2016 @02:53PM (#11678122)
Correct, supporting existing extensions constrains the architecture of Firefox.

Extensions themselves can also introduce performance problems of course.