Options -> Under general tab select "When firefox start Open my previous tabs. If that doesn't help . Reset firefox . Options -> Troubleshoot -> Reset

where is the options tab?

It should be Options or Preference. It should be available within top line buttons (Menu Bar) . Search it At the Top line button of your windows

i found it but im trying to recover my tabs from yesterday and this aint working

Well for that open you history, hopefully you will find all of them over there.

Press ctrl + h . Withing today tab search your browser.

Sorry You need to search each and every link within today, bcoz link are not order over here.

If you use the Time Machine on your Mac then you can try to restore an older version of the sessionstore.js file.

• http://www.apple.com/support/timemachine/

• http://kb.mozillazine.org/Session_Restore
• https://support.mozilla.org/kb/restore-previous-session

You can use this button to go to the Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox

i just found out today that my time machine has not been working as i need to put in a external hardrive to make it work

If you do not have a sessionstore file with the tabs then you can look at the history or cache (about:cache) to see if you can reconstruct some of those tabs. Otherwise it is likely that you have lost them.