Why does firefox forget some of my tabs when reopened?

This is strange but recently I started noticing that when reopening my previous session some of my tabs are blank pages BUT it retains the favicon used for that tab - now that's fine if I know which site the favicon is from. Typing the site in will bring up the history but if I dont know it I'm screwed. I noticed this started happening with ver. 33 onwards I'm not sure where the issue lies. is it an addon? (haven't installed any recently) Is it a problem with the browser? is it a combo of both addons and browser? No clue. Attached is an image of the issue.
Note: The upload images option wasn't functioning properly so here's a link to the pic I was referring to: http://i.imgur.com/nqn183P.png

Are you using "Clear history when Firefox closes"?
*Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings

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