Firefox will not restart old session

It began a few days ago. I had started up firefox expecting my old session to turn up, as I had selected the settings for it to reappear. However, I was given a tab with a video about firefox, a tab with the firefox homepage search engine, and every time I open a fresh new blank tab, it gets redirected to some strange address which the servers cannot actually find. I ran malware and spyware, and got rid of stuff, but the sessions will not reappear unless i manually select things in the history, and the all the settings i changed in firefox reset to defaults.

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