Hi Jack, do you mean, for example, on search results pages, that the headings of each result are colored? That can be caused by an add-on associated with your security software, which is conveying whether it believes those sites are safe or dangerous. To review your extensions you can use the Add-ons page. Either: * Ctrl+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Extensions. Then case a critical eye over the list on the right side. Feel free to disable the ones that do not seem especially useful, since all extensions are optional and none come with Firefox. ---- If you don't think it is related to that kind of feature, could you describe where the highlighting appears in more detail. Perhaps it would help to post a screen shot illustrating the problem. This article has tips on how: [[How do I create a screenshot of my problem?]] Please cut or blur out any sensitive information in the image before attaching it to a reply.