I use Firefox all day on both Mac and Windows and this rarely happens. It does seem to happen on Linux for me sometimes though.

Today there was a page on my bank that just would not load in Firefox even though the rest of the site was fine. Switched to Chrome and it worked fine. I only use Chrome in these situations.

I have a BananaPi M3 and the software support was horrific. Getting a kernel to compile with the hacked drivers and firmware was like black magic.