Error will not let me load most website URLs
I think I have some form of virus.
I do not have anti-virus software, and I've not recently downloaded anything so I'm a bit confused and slightly worried!
I have 3 browsers (Safari, Firefox and Chrome) and in all of them when I type a URL in I'm getting the below error message which begins as below. The only URLs that I can type in and not seem to get this redirect are Google, Apple and Facebook. I've disabled/removed any Safari extensions... but getting the issue across all browsers anyway. Any help much appreciated. Thank-you.
ERROR: You're still using a legacy immunicity PAC file
(Immunicity was seized by the UK Police in August 2014!)
You tried to access the URL http://theguardian.com/
MacBook Air, OS X Yosemite