Here’s a quick post about resolving an issue about the Firefox icon disappearing and showing a generic Windows icon. It came up while I set up my laptop, A quick Google search gave me a solution. It involves rebuilding the Windows 7 Icon Cache.

Link: http://www.heerengandhi.com/2009/07/29/firefox-icon-went-missing-in-windows-7-heres-a-fix/comment-page-1/