I was having issues and it turned out that my system date and time were wrong (don't I feel the fool, thanks all who helped). Anyway did loads of things to try and fix issue including a reset. Is there anyway I can recover, transfer, whatever the correct term maybe, my bookmarks from the old firefox data folder back to my browser?
If you reset Firefox then a new profile is created and some of your data (bookmarks, history, cookies, passwords, form data) is automatically imported and your current profile will be moved to the desktop (Old Firefox Data).
You will lose extensions and other customizations (toolbars, prefs) that you've made.