None of this would be an issue...

None of this would be an issue if browsers were actually used *as browsers*, instead of as a sub-par general-purpose applications platform. The two uses have different goals and, now, different development cycles. That is not a bad thing. If a new Firefox version is capable of significant disruption to your business applications, those applications are broken as designed.

There are safe, long-term-supported choices for application platforms. Browsers aren't and shouldn't be one of them. I'm not a fan of version inflation for marketing purposes, but I'm certainly not complaining about Mozilla's move on support grounds.