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#11
No, 3.6Beta5 does not "suck"; it is much more likely that you need to create a new Firefox profile, and/or run in Safe Mode to determine if one of more of your installed extensions and/or themes is/are the proximate cause of the problems you have encountered.
Profile Manager - MozillaZine Knowledge Base
Safe Mode - MozillaZine Knowledge Base
Experience for several years has clearly shown that most problems imputed to be the fault of Firefox and Thunderbird are, rather, matters more properly assigned to the specific installation, and, thus, relatively easily corrected.
Were Beta5 to be as bad as you seem to feel it is, there would be vastly greater numbers of complaints being posted on MozillaZine than are actually being posted there.