Copy your Firefox profile from your application data on your computer's hard drive.

Thanks ... but I am not sure where I find the Firefox profile and exactly what you mean by 'application data on the hard drive'. Could you send me a step by step guide for a basic user! Many thanks

Sure thing.

1. Open the run dialog by holding the Windows key and pressing R
2. Type %appdata% into the run window and press ok
3. Open the Mozilla folder
4. Open the Firefox folder
5. Open the Profiles folder
6. Copy the folder that is located in this folder to a USB drive
7. Install and run Firefox on the new computer
8. Close Firefox
9. Repeat steps 1 to 5 on the new computer
10. Open the folder that you copied from the old computer
11. Copy the contents of that folder into the folder located inside of the new computer's profile folder
12. Allow Windows to replace any duplicate folders with the ones that you are copying onto the computer is prompted

If you have any problems following these instructions or if you need further help, please feel free to comment below.

See:

• https://support.mozilla.org/kb/how-do-i-use-bookmarks
• https://support.mozilla.org/kb/restore-bookmarks-from-backup-or-move-them

• http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox