How can I find why certain apps are draining my battery (when they are not in use)?

My phone (Galaxy S22+, running OneUI 6.0) was inactive yesterday for 18 hours straight. On those hours the battery went from 60% to 25%. I checked and the main two causes were: 13.6% - Firefox 12.2% - Always on Display. The AOD I get, it was indeed on all this time. Altough it is a bit disapointing that it uses this much battery, it is still less than 1% per hour so I'll take it. I have not idea why Firefox was even on this list? What can it be? Why was it active? How can I check it?