By the way, the system used on the old disk drive was Windows 2000. I'm assuming Firefox files for Windows 2000 are different from the Windows XP version.

https://support.mozilla.com/en-US/kb/Recovering+important+data+from+an+old+profile

Thanks for the tip. I did indeed find the hidden Profile directory on the old hard drive, but that folder does not have the [places.sqlite] file containing my old bookmarks. There is such a file in the current Firefox directory (on my C: drive), which is the one that needs to be changed. The only [.sqlite] file of note that I found on the E: drive was [urlclassifier.sqlite] -- is that from an earlier Firefox version???

Never mind... I was looking under Default Users. I got back to the right folder and "Presto! Here's the file!" Thanks a million. I got all my stuff back. Cheers.

You're welcome.

I have a recent acronis backup. My bookmarks disappeared and the restore backup fails. I see application data\mozilla\firefox. I would think that I can simply copy ALL the files from my backup drive and be back where I was. Correct?

That seems plausible, but why are you restore backups failing ? you may just get back to a position where you have no bookmarks. Have you seen Lost bookmarks

Hi Ambreville,

Have similar problem as you. cannot open firefox anymore. I would like to get to the directory that stores all the bookmarks and manually copy them elsewhere before doing a reinstall of firefox. Your feedback will be highly appreciated Thanks

Go there -- the info you need is explained there:

https://support.mozilla.com/en-US/kb/Recovering+important+data+from+an+old+profile