Impossible to update 3.16 to the latest version of firefox crashes

I have a less than a years Lenovo computer, running windows 7, 64 bit... I'm under 3.6.14 because... (drum roll please) I had the version 3.16 and then when firefox 4 is out, I tried and he hated, then returned (after looking for him and find the file for the old version) installed and kept, then my daughter insists on security, I update to version 15.1, so yesterday, I tried this, and it started crashing crashing crashing. She told me to get out all the previous files of mozilla, versions, I did, always crashing, then told me to try installing lower versions, I tried 5, 6, 7, 9, 11, 15 ALL No. AVAIL! not open not except in safe mode, even if it does not open after the superior version. I don't KNOW what else to do! I'm finally back to use the old version 3.6.14 only because I've always had on a flash drive and could find no other door in mozilla, I tried reinstall (and Yes, disconnected, turned off computer, return, whenever I uninstalled and reinstalled) has spent hours trying to get there, apparently I can't upgrade to all because its does not work. I need to know step by step how to get to the last version, but without losing all my favorites etc, I've spent years to get those and my addons.

If Firefox 15.0.1 open only in Mode safe?

We're going to the following:

Download Firefox 15.0.1 www.getfirefox.comand install it on Firefox 3.6 (your daughter is right, that old of a version running leave your information at risk).

If it still crashes, try turning off hardware acceleration: turning off hardware acceleration

Finally, if this does not work, try resetting Firefox, Firefox Refresh - reset the parameters and modules

Tags: Firefox

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