Twitter is working fine for me as well. Try to clear your cache in Firefox, see if that helps. [[Websites look wrong or appear differently than they should]]

As I have already said i my original post I have cleared everything in firefox, including the cache.

See: *http://kb.mozillazine.org/Error_loading_websites You can try to reset (power off/on) the router. ---- Do a malware check with some malware scanning programs on the Windows computer.<br /> You need to scan with all programs because each program detects different malware.<br /> Make sure that you update each program to get the latest version of their databases before doing a scan.<br /><br /> *http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware *http://www.superantispyware.com/ - SuperAntispyware *http://www.microsoft.com/security/scanner/en-us/default.aspx - Microsoft Safety Scanner *http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page *http://www.safer-networking.org/en/index.html - Spybot Search & Destroy You can also do a check for a rootkit infection with TDSSKiller. *http://support.kaspersky.com/viruses/solutions?qid=208280684 See also: *"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

I'm not sure what caused it but when I went back on after posting this Twitter has since worked fine. Thanks for the help though!