I've been trying for some time to make webroot compatible with FF. Today Webroot seemed to have found a solution, however after restarting the computer crashed. It fixed itself. I then started FF and version 8 of FF was installing and told me webroot is incompatible. Despite me cancelling the installation it still is on my computer. I tried the add-ons help but there is no "enable" button for webroot, only a "remove" button. How do I go back to an earlier version of FF that works with webroot as webroot is unable/unwilling to fix the problem.