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3. I use Firefox all day every day on my mac(s) and have absolutely no problem with it. What problems do you have?

page rendering, js performance, ram usage.

Is your machine very old by any chance? Although, that said, I have no problems on a 2013 MBP.

I still use a 2012 MB Air as my home laptop. I've used Firefox on it forever and have never had a problem.