Flash Plugin for Firefox, Opera, Seamonkey....
Download Flash NPAPI 32-64 bit Plugin (15 MB)
Download (Pepper) Flash PPAPI 32-64 bit Plugin (16 MB)
(included also Adobe Reader plugin 11.0.20.17 but need installed program)
Extracted once in CommonFiles\Plugins in your PortableApps folder (if test fail run latest browser installer).