everytime i turn on my computer i click on fire fox?

[Juan]

So everytime I open up fire Fox it never goes to Google anymore it's always going into Google search on facebook its kinda annoying now I want to see Google when I open it not facebook search and another window also opens and it says web page not found facebook isn't my homepage y would my computer do this for there's been times when the power goes out. And when it comes back it would take me back to the page I was on when the power went out and it's kinda the same thing when I open Firefox it take me to the facebook Google search please help