After I jailbreak with redsnow my safari browser keeps crashing. Must I unjailbreak or something ??
Reboot. If that fails restore and rejailbreak. I personally don't like redsnow. I've had too many problems with it. What custom firmware option did you setup? It also might help if you just install Cydia.
No. Plug in your device, launch redsn0w again (or download it again and launch it), and click "just boot tethered now".
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