[Angelino97]

The Import option on the new Firefox only gives me the option of importing from MS Edge, which is already on the system. It has no Browse option.

[Trot]

Be sure to copy all those files into a new folder. Then try importing them to Edge, which you needn't ever use, then import them to the new Firefox.

Don't know if that'll work, but it's worth a try and should only take a few minutes.