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firefox installs on my macbook air but won't open - this is weird because it works fine on my macbook pro and imac

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I have an iMac, MacBook Pro and MacBook Air. Until recently Firefox worked fine on them all and was my default web browser. Suddenly and with no other indications, FF wouldn't load on my MacBook Air. The opening sequence commences but hangs up with a "loading" indication. I have tried uninstalling FF with CleanMyMac and reinstalling. All is fine until I attempt to open FF when again I get a hang up with the "loading" indication. FF is still working fine on my iMac and MacBook Pro. Weird or what!

I have an iMac, MacBook Pro and MacBook Air. Until recently Firefox worked fine on them all and was my default web browser. Suddenly and with no other indications, FF wouldn't load on my MacBook Air. The opening sequence commences but hangs up with a "loading" indication. I have tried uninstalling FF with CleanMyMac and reinstalling. All is fine until I attempt to open FF when again I get a hang up with the "loading" indication. FF is still working fine on my iMac and MacBook Pro. Weird or what!

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I have that problem too! Have anyone figure it out? Help!!

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So this is a problem that many people have, but there is no answer to it, in 10 months. Very bad service from Firefox. I think I will move to Google Chrome.

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This page gives easy instructions for fixing this problem in two minutes by changing your Firefox preferences: http://support.mozilla.org/en-US/kb/Opening%20PDF%20files%20within%20Firefox#w_pdf-files-are-blank-and-cant-be-downloaded