It's not about the number of (possibly sleeping) tabs, it's about how FF doesn't manage those active ones to prevent the app from crashing.. try opening 10 instagram profiles (via open in new tab) in the web browser.
replyI told you all that Chrome doesn't crash, FF does + pages work much slower.
Have you verified what caused the crash via logcat? Firefox has never crashed in my case, not even once (but I'm not running a low ram device).
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