Hi, Sydney,
I've loaded about a dozen pieces over the last 24 hours, all with Firefox, all with no problems. Like you, I dislike Chrome, but will use it in a pinch. I try not to use IE at all.
I love Firefox, but it's no longer the lean, mean, wonder that it used to be. When I have random FF problems, it's most often related to an Add-ons glitch. Usually this sequence works:
1. Disable add-ons (not uninstall!).
2. Exit Firefox.
3. Restart Firefox.
4. Enable add-ons.
5. Restart Firefox.
At that point, I'm almost always back to business as usual. :-) Also, I run Glary Utilities, as part of my weekly maintenance, to clean up all traces of browser 'temp' and other trash files -- that really helps to keep things running smoothly.
I hope you'll update here, if you ever find the answer to your problem. Enquiring minds want to know! ;-)