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How little RAM does your phone have? My Moto G4 Power (less than $200, before the RAM crunch much less) with 2 GB runs Firefox hunky-dory, and I'm one of those triple-digit tab people.
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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.

I told you all that Chrome doesn't crash, FF does + pages work much slower.

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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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You obviously don't know how Android works. When an app hasn't been open for a while and it has no background tasks, it gets put to sleep. Waking it up takes a second.

You can delay that by selecting the app in the settings and choosing its Battery setting to Unrestricted, however, despite its name, it will still get suspended

The checks are poorly coded. Even on Unrestricted, if you play music from a web player, the browser will get suspended after the song ends but before a new one starts playing because there's a point where it awaits data on the foreground task, Android sees it has no background tasks and suspends it.

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Man, I backported freezer v2 cgroup implementation into 4.4 kernel so these cached tasks are suspended, don't tell me how Android works please :)
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What are you running, Android 9.0?
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