Kudos to those in previous threads recommending the work-alike Pale Moon browser to replace Firefox – very close to the same experience, and the Import function brought in nearly every configuration setting & my extensions.
Now if its authors keep their noses clean politically, I think we’ll stick with this app…
I just downloaded and installed it. You need the profile import tool to bring in all of your Firefox settings, addons, and bookmarks.
It's based on Firefox code, looks and quacks like Firefox and appears to behave like it in every way that matters. Most users will never notice the difference.