Import from file... is currently broken. A bug report has been filed. As an alternative, Import from another browser...

You can possibly install Firefox 102 ESR to import the CSV file and generate the logins.json and key4.db files and copy these logins.json and key4.db files to your current release profile. Use the version selector to select Firefox 102 ESR.

• https://www.mozilla.org/en-US/firefox/all/#product-desktop-esr

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).

• Help -> More Troubleshooting Information -> Profile Folder/Directory:
  Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder
• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

A possible solution is mentioned in a Reddit thread (remove the blank space in the link below).

https://www.reddit. com/r/firefox/comments/vzq8fj/firefox_nightlys_logins_passwords_not_importing/igg0plb/