How do I prevent browser-highliting of non-url link words?

hello LeeW, this sounds like a problem caused by adware on your pc. first of all please [[Update Firefox to the latest version|update Firefox to the latest version]], you're using an outdated version which is affected by quite a few known security vulnerabilities. then go to ''firefox/tools > addons > extensions'' & remove any suspicious entries (toolbars, things that you have not installed intentionally, don't know what purpose they serve, etc). also go to the windows control panel / programs and remove all toolbars or potentially unwanted software from there and run a full scan of your system with the security software that you have in place and different other tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] & [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner]. [[Remove a toolbar that has taken over your Firefox search or home page]] [[Troubleshoot Firefox issues caused by malware]]