I'm using the latest version of Firefox and a lot of pages (Explore, other lands, sometimes inventory, etc) seem to not want to finish loading for me. The loading icon that takes the place of the Kumos head when loading just keeps spinning around and around without stopping to let me know that the page is done loading. It's a bit annoying lol Is anyone else experiencing this? I'm going crazy XD

You're not alone... I've got it too.
RIP Mom, I love & miss you more than you know. Tell Dede hi.
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I've gotten this on and off on Subeta for so long I'm not entirely sure when it started. Maybe it's been going on as long as I've been a member.
It only ever happens on Subeta, and yeah, it's like the little icon will spin and spin (though usually it eventually stops after a few minutes). I'm not entirely sure what's trying to load. Most of the time when this happens it seems like the answer is nothing, that everything has already loaded, and it's just stuck "loading" for a while. Generally when I see it doing this I just stop it manually.
Could this be the same problem that's been discussed in topic * lag! - wth is js.pusher? for 6 months already? It seems to affect FF users only.
Are you still having trouble with this?