When I open Firefox, it opens my last tab instead of my homepage.

When I open Firefox browser, it opens the very last tab I had open instead of my homepage. It's getting very annoying since I can't figure out why or how to fix it.
~I have not installed any new software, search engines, or add-ons recently that would have caused this to happen.
~I have checked control panel > uninstall programs (searched by date added) to see if there were any unwanted addware or plug-ins that were installed, and I did not see any.
~I've played with the preferences by setting it to "Show my home page", "Show a blank page", and "Show my windows and tabs from last time". But nothing changes.
~I've done a few searches on the internet to see if anyone else has had this problem, or if there are any solutions I could find, but I can't find anything that sounds like my problem. Especially since this started happening right around the time Firefox updated to 31.0 (was it on 7/30/14? something like that). Although I must admit that it seems like it was acting up before that....but maybe not.
It's getting a bit frustrating that I can't figure out why it's doing this, or how to fix the problem. I'm hoping someone can point me in the right direction to finding a solution.
Thanks!

You can check if you have a <b>user.js</b> file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.
*http://kb.mozillazine.org/browser.sessionstore.resume_session_once
Note that Windows hides some file extensions by default.
Among them are .html and .ini and .js and .txt, so you may only see file name without file extension.
You can see the real file type (file extension) in the properties of the file via the right-click context menu in Windows Explorer.
*http://kb.mozillazine.org/Show_hidden_files_and_folders

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