Why does Firefox keep redirecting me?

I have a MacBook Pro.
OS X 10.8.4
After I open Firefox and type a website to navigate to, it initially opens the page but then immediately redirects to another page. Sometimes it redirects to Lycos.com, or another random advertisement page. Other times it redirects to an all grey page with a notice saying my Java is out of date, which it is not, as I have made sure through my software update. Along with this problem, there is a portion of the browser (lower left hand corner) that seems to be blocked by an invisible object. I say an invisible object because the cursor changes to a finger cursor as if there is a link or click-able ad, however I have tried clicking the area and nothing happens, not even when right clicking.
I really love Firefox and prefer using it over Safari but these issues have really tainted my experience with the browser.
Somebody please help!!!!

Hi iambdwilson, sorry, the Troubleshooting Information screen changes depending on your OS. On Mac, the button to view your current profile folder is called "Show in Finder".
But it's very unlikely that such a dyanamic behavior is caused by a setting in your user.js file. I suggest investigating your add-ons.
To quickly see whether any of your extensions is relevant, you could try Firefox's Safe Mode. That's a standard diagnostic tool to bypass interference by extensions (and some custom settings). More info: [[Troubleshoot Firefox issues using Safe Mode]].
You can restart Firefox in Safe Mode using
Help > Restart with Add-ons Disabled
In the dialog, click "Start in Safe Mode" (''not'' Reset)
Any difference?

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Why does Firefox keep redirecting me?

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