It's truly weird and I don't understand it. I mean not to defend Firefox but the HN reaction is almost comically extreme.
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Chrome: ...and so our company's puppy kicking campaign was a total success. In other news, we're updating our terms of service so that you agree to hand over your first born child.
HN: Meh, I'll still use Chrome though.
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Firefox: Today we fixed a bug that...
HN: OMG FIREFOX SUCKS. I'M USING CHROME NOW.