Hi Tony
With any luck, you'll never know anything happened. But it must be said, this was probably Mozilla's biggest ever screwup and it isn't over yet. Temporary glitch it maybe, but that doesn't mean "quick". Reading the bug reports on Bugzilla, there are many subtleties here not evident when they first sent out the fix(es). And droves of people are posting how badly they're suffering as a result. The Firefox twitter feed has dried up, nothing new since early May 4th (despite them singing off with "More to come soon").
For me, the fix I posted up top worked instantly on Win7. It didn't work for me on Win10 - no idea why.
Tor folks should go to the Tor blog. They have an about:config fix which, with caution, you can apply.