For everyone that can't figure out how to export their Firefox Passwords, I found this today - finally!! I used to use Password Import addon in Firefox to export my passwords. But since version 57 of Firefox the password export addon no longer work. Mozilla provides no other official alternatives. "FF Password Exporter" makes it quick and easy to export all of your passwords from Firefox. You can use FF Password Exporter on Windows, macOS, and Linux distributions. IIt exports the passwords as .csv file. I did this and now I have all my passwords in an excel sheet, and can now import the .csv file into Last Pass! Finally!! I have been battling with this problem for MONTHS!!
Here is the link: https://github.com/kspearrin/ff-password-exporter