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Fix slowness, crashing, error ...

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Fix slowness, crashing, error messages and other problems

In English

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Firefox for mobile is slow - How to make it faster
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How to fix common problems with Firefox OS Developer Preview
Firefox is stuck in Safe Mode
Firefox for Android may cause HTC Desire with Android 2.2 to reboot with casual browsing
Firefox repeatedly opens empty tabs or windows after you click on a link
Fix printing problems in Firefox

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