I am unable to import logins using a csv file even though I followed instructions and enabled that functionality on the about:config page. After choosing "Import from a file" I get a page with a yellow header asking me to enter my "Primary Password" to view logins. When I click the "log in" button to do this, immediately I get an empty page that says "No synced logins found."

My logins disappeared after I "refreshed" Firefox. Now I'm sorry I did that. I do still have the logins on a different computer (hence the csv file).