As l said, in my experience Firefox is more stable on certain sites. The local bank l use is a classic. Can't open any page after the home page on Safari, yet on FF, no worries.
I think it's a Jingly thing.
As an aside; Took my kids PC to the repair house (again!) and they had put one of those white apple stickers on the side, to which the repairer said they don't work on Mac, even though it had DELL all over it. This after four days in the shop!
halas