Update: Edge Chromium can now import from Firefox. Unfortunately, despite documentation saying it can import all history and can retain all history, in fact it only keeps 3 months. So, it only imported the last 3 months OR imported all and them promptly deleted all older than 3 months. Every day, history older than 3 months gets pruned.

BUT even if it had imported and kept it all, the history is so hard to access it wouldn't be practical. History is viewed in a list that gets populated as you scroll. To get to the history for say a month ago takes forever and wears out your mouse.