When I go to a website, it takes me to a different one. No matter how many times I open it, it takes me to random sites.
If I open a page in a tab it will take me to a completely different site, and no matter how many times I try to close and open a new one, it keeps going to different sites. It also happens when I type the website into the address bar, it still takes me to a random site. Is it something with my computer, or is it Firefox, and if it is a problem with Firefox, how do I fix it?
Sounds like Malware on your PC.
Install, update, and run these programs in this order. (Not all programs detect the same Malware.) They are all free for personal use, but some have limited functionality in the "free mode" - but those are features you really don't need to find and remove the problem that you have.
Note: If your Malware infection is bad enough and you are mis-directed to URL's other than what is posted, you may have to use a different PC to download these programs and use a USB stick to transfer them to the afflicted PC.
Malwarebytes' Anti-Malware - http://www.malwarebytes.org/mbam.php
SuperAntispyware - http://www.superantispyware.com/
AdAware - http://www.lavasoftusa.com/software/adaware/
Spybot Search & Destroy - http://www.safer-networking.org/en/index.html
Windows Defender: Home Page - http://www.microsoft.com/windows/prod.../default.mspx
If these don't find it or can't clear it, post in one of these forums for specialized malware removal help:
Also, the More system details... to the right of your posting shows that you have a few Plugins that need to be updated. See the Mozilla Plugin Check page.