I lost all my bookmarks too. Watching video like you. I got all of my bookmarks back and never had done back up.
Do this:
You will need to change your folder view to show hidden files and folders. This can be done by clicking My Computer-->Tools-->Folder Options-->View-->tick the option next to Show Hidden files and folders.
Then, find this folder:
C:\Documents and Settings\Account\ApplicationData\Mozilla\Firefox\P rofiles\9theoxlg.default\bookmarkbackups
Where it says Account in the example, this will be the name of your user account. The path to your bookmarks may differ a bit, but it should be very close to the example above. You may need to be the administrator, or have administrators access to view this folder, as it contains important data related to your Firefox settings.
I saw 2 profile folders 1: the new one with hardly anything inside. #2 is the unused old profile with my 500k bookmarks html page. You can import it right back into firefox. Hope this helps!
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