Check that plugin scanning is turned on (it should be by default). If it is turned off Firefox will not search the Windows registry for details of plugins that it can use. # Type '''about:config''' into the location bar and press enter # Accept the warning message that appears, you will be taken to a list of preferences # Locate the preference '''plugin.scan.plid.all''', if the value is set to '''false''', double-click on it to change it to '''true''' If it was set to false, re-start Firefox to see if the Flash plugin is now available. ----- Also make sure that you have installed the version of Flash used by Firefox. You should have it because SeaMonkey is using it, but if the Flash plugin is in SeaMonkey's own plugins folder Firefox may not be able to see it. Download the latest plugin from http://get.adobe.com/flashplayer/completion/?installer=Flash_Player_10.2_for_Windows_-_Other_Browsers and run it to install the version of Flash used by Firefox, this will install it in the default location so that Firefox should be able to find it.