'Recently Closed Tabs' cleared on its own?

[Tek4MNewbie]

I am currently using Firefox 3.6.17. Today I opened up my browser and went to my 'Recently Closed Tabs' list and it had been completely cleared. I went to look at my History (under 'Show All History') and all of my recent history was still there. It just wasn't on the Recently Closed Tabs list anymore.

I know that this can be cleared manually by going to 'Tools'>'Clear Recent History'. I'm just hoping that there could be another explanation, because otherwise, it probably means somebody has figured out my computer's password, used my browser, and then cleared the recent history to cover their tracks. I'm crossing my fingers that there is another possibility...Is there?

 

[KSoD]

Your best bet is to ask Mozilla directly. Cause you said exactly what we all know. But I doubt you will get to much of an answer from them as well as they are no longer supporting any version other than Firefox 4 if I remember correctly.

Change your password as an extra measure.