I swear I saw something like this here on Lemmy but I can't find it.

I know android manages the RAM very differently than any desktop OS as it frees up RAM in order to have it available for other processes being third party or core ones.

I remember I saw something that you could fiddle with within the Firefox config page.

Or is it not possible on Android?

I'm using Firefox Nightly, because I think it is the only version that has a working pull to refresh.