Widespread reports on multiple news sites that Safari browsers are crashing, as of today. My iPad 2, (iOS 9.2) wasn't crashing, but I was able to make it crash after opening settings App and turning on 'Safari Suggestions'. Then following closing and relaunching the App, sure enough, it crashes with the first keystroke I hit in the address bar.
The avoidance, obviously, is to go to settings and disable 'Safari suggestions'. That's my preferred setting anyway, hence I hadn't noticed. Rumour has it that OS X Safari is affected too, though mine seems OK. Haven't yet played with settings to see if I can reproduce it.
It will be fascinating to see if Apple ever provide a decent technical explanation for this?