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Mac 10.11.2 Firefox unresponsive and extremely slow

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Locking duplicate thread.
Please continue here: [/questions/1103535]

Since my last update the browser became impossible to use. I checked other threads, re-installed and have implemented a few fixes with absolutely no results. It's dead!

<i>Locking duplicate thread.<br>Please continue here: [[/questions/1103535]]</i> Since my last update the browser became impossible to use. I checked other threads, re-installed and have implemented a few fixes with absolutely no results. It's dead!

Modified by cor-el

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btw just updated to 43.0.4 and it's marginally faster but still impossible to use