You can copy certain files with Firefox closed to the current profile folder to transfer or recover personal data.

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

Firefox uses two locations for the Firefox profile folder. Location used for the main profile that keeps your personal data (Root Directory on about:profiles).

• ~/Library/Application Support/Firefox/Profiles/<profile>

In Mac OS X v10.7 and later, the "~/Library" folder in the Home directory is a hidden folder.

• https://www.macworld.co.uk/how-to/mac-software/hidden-files-mac-3520878/

• bookmarks and history: places.sqlite
• favicons: favicons.sqlite
• bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder
• cookies.sqlite for the Cookies
• formhistory.sqlite for saved autocomplete Form Data
• logins.json (encrypted logins;32+) and key4.db (decryption key;58+) for Passwords saved in the Password Manager
  key3.db support ended in 73+; to use key3.db in 58-72, make sure to remove key4.db
• cert9.db (58+) for (intermediate) certificates stored in the Certificate Manager
• persdict.dat for words added to the spell checker dictionary
• permissions.sqlite for Permissions and possibly content-prefs.sqlite for other website specific data (Site Preferences)
• sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder)

i got my solution, thanks

This has NOT solved my problem. I worked with the support documents for over 2 hours last night and could NOT resolve the issues. I'm computer literate and I couldn't make sense of the steps. Either files weren't where they were supposed to be or I had no way to access them. The support documentation sent me off in 3 different directions. This has to have happened to other people and there should be a nice step by step way of recovering the files. Chrome has it, Safari has it, and I can't believe FireFox can't come up with a direct set of directions for doing this. I always thought FireFox was the better product. Please, someone out there, help!!!! Thank you, David

How about plugging in a external monitor? https://www.youtube.com/watch?v=wEVqbjnt4GI

Then use Sync to copy your data to the new device. https://support.mozilla.org/en-US/kb/sync-custom-preferences https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer https://support.mozilla.org/en-US/kb/how-do-i-choose-what-information-sync-firefox