Firefox black screens and more problems?

So as of about 2/3 weeks ago my firefox hasn't been itself for some reason unknown to me. Every time i load it up it starts as a black tab then loads to google. This black tab problem happens on 90% of websites i open, before it loads the tab is black. Another problem I am having is with pop ups. I use a website and to download thing its a pop up and it works fine on IE and Chrome but with firefox it freezez and then Firefox crashes. I'm also getting a lot of what i would call lag again only with Firefox as it's taking longer than it used to, to do anything.

I have tried resetting it, I have tried uninstalling completely and reinstalling but still no difference. Btw I'm on Windows 8 if that helps anything.

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