I have been experiencing safari crashes on my Gen1 ipad since iOS 5, if not earlier. My initial experience with the gen1 ipad was wonderful, but then the constant browser crashes have made my experience miserable. Friends have told me to watch the memory levels and crash logs. I have also gone to the Genius Bar to have this investigated. They did a restore and told me to shut down the ipad more often. Unfortunately, the crashes have continued.
I recently purchased an iPad Air hoping that, amongst other thing (like being able to run apps that require iOS 6), that the browser crashes would stop. No such luck. I am using the air now, and the browser crashed as I tried to start writing this post. Most often it crashes on Facebook, but it also crashes downloading PDFs and other "simple" tasks.
Very disappointing. Makes you want to throw the thing across the room.
My answer is typically to grab one of my kid's samsung tablets. I have to squint at the screen...but they don't crash.