There's a nasty error / regression in this new version. I hope to goodness it's merely an unfortunate temporary oversight by Mozilla Devs, & not a permanent loss of function.
v63.0b1 has LOST the "Load this bookmark in the sidebar" Bookmark Properties setting...
...& consequently all my specially arranged BM Toolbar BMs that i need to open in the SB not the standard window, for my optimal workflow, now only open in the standard window. This is completely unacceptable to me, & so i had to Downgrade to
firefox-developer-edition-62.0b20-1 to fix it. If this silliness is to become truly a permanent "feature" of FF-DE then i'll later have to downgrade simply to standard FF... but presumably over time that will also lose the setting. Gahhh.