In this latest update (Firefox 111.0 for windows) the notifications are different and compared to the previous versions. I preferred Firefox over Chromium browsers because of the fact that previous firefox notifications were simple, instant and multiple notifications from the same source could stack one over the other. It's important for my work. I'm obliged to revert back the previous persion due to this change, the notifications now show up as windows toast in the 111 version, and don't stack one over the other.

I've added example of previous notifications and the current one. 2 notifications at a time but they aren't stacking in the new version.