Hi, yes Flash is still compatible with Firefox. The latest version of Flash is 26.0.0.137 If you are having trouble updating Flash; close Firefox, then using another browser, download and install the latest version from https://get.adobe.com/flashplayer/otherversions/ - take care to deselect any optional offers! ''If your question is resolved by this or another answer, please take a minute to let us know. Thank you!''