Firefox will not open with my previous session

[I am posting this question using IE.]
Last night when I quit Firefox I closed the browser without noticing an ad in a new browser window had opened. Thus, my last browser open was the ad page.
So when I open the browser now, it tells me "Firefox is having trouble recovering your windows and tabs. This is usually caused by a recently opened web page." The only option is to restore "Advertisement".
I have done a complete search on my computer. The only other sessionstore files (sessionstore-nn.js) are located in a differently named profile folder dating back to May, 2012.
In my current profile folder I have sessionstore.js and sessionstore.bak.
The sessionstore.js file represents Firefox opening with NO old tabs; it is 1 KB in size.
The sessionstore.bak file represents my "last" browsing session; it is 11,952 KB.
I close Firefox (Mozilla home page) by clicking on File, Exit.
In the Profile folder I rename sessionstore.js (1 KB) to sessionstore.js.bak. In other attempts I have rename it sessionstore.tmp, sessionstore.old, etc.
I then rename sessionstore.bak (11,952 KB) to sessionstore.js.
When I restart Firefox (V 24.0) I get the same error message, "Firefox is having trouble recovering your windows and tabs. This is usually caused by a recently opened web page." The only option is to restore "Advertisement".
Restore Previous Session is grayed out; there is no button on the home page to restore a previous session.
So, is the sessionstore.bak (11,952 KB) *really* just the advertising page? If so, where is the sessionstore file that contains my actual previous browsing session? (More tabs that you can imagine.)
What should I try next to get Firefox to open with my "lost" browsing session?

When I click on Tools - Options - Privacy, Firefox will Remember History.
I do not see an option to 'Clear History when Firefox closes - Exceptions'.
There i* a line below History which states: 'You may want to *clear your recent history* or *remove individual cookies*'. The text enclosed within the asterisks indicates a link.
I have not clicked on 'clear your recent history'. Please see the attached image.

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