Firefox asking for flash plugin ?

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http://forums.fedoraforum.org – Running fedora 17 on ibm thinkpad t60. Install of F17 went fine, when I go to a site that has video to display a box pops up in upper right corner that says "install plugin" The file I download is in RPM format. I don't know how to install it. Any help would be appreciated. Thanks ! Newbie here - (HowTos)