Look on your desktop. Do you see a folder called; Old Firefox?

https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

No, unfortunately I don't. I don't seem to have such a file anywhere in my computer. And the thing is, I tried to restore at least my bookmarks from my phone, but now I have another problem. I couldn't log in so I had to change my account password. So now, I have all my bookmarks on my phone, and if I let it sync to the laptop I'll lose everything from there to.

Have your cell log out of sync to protect its data.

If you can, Copy the profile on the cell to a safe place on the computer.

I called for more help.

Thank you very much for your advice!

I solved it finally. What I did, was log out of sync, and then change the bookmarks' location on the cell. So, instead of them being on the cell's bookmarks file, they were seen as being on the computers' file, although they were still on the cell. Then I logged in on my profile, I turned the sync on and after a short while they were back on my computer, working just fine.

Thank you so much for your time and effort, I hope someone else finds this solution helpful too.

Glad to help. Safe Surfing.

As a precaution, Copy the current profile to another folder on the hard drive. Repeat this once in a while although daily would mean less data loss.