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