In the Firefox menu bar, click "Help" and select "Troubleshooting Information". The about:support page will open.

   Under "Application Basics", click on "Open Containing Folder" (Windows and Linux) or "Show in Finder" (Mac OS).

Now, copy the contents of this folder. Now drop it on something like a usb stick in a new folder. Open the profile folder on the new computer with firefox on with the steps in the first paragraph one again, and move the folder you copied earlier inside, only the contents though. Not the actual folder on your usb stick. If you get asked if you want to replace, click yes. Now, restart firefox and your bookmarks should come up.

Works like a charm, thanks a million, made my day