Pogo did have some issues with Firefox 40 at first, but their help page says it was fixed: http://news.pogo.com/firefox-update-may-cause-game-loading-issues/ What version of the Flash player ("Shockwave Flash") plugin do you have currently? You can use my plugin lister page to get that information: https://jeffersonscher.com/res/plugins.html The latest release is 18.0.0.232. If you need that one, you can get it on this page: https://www.adobe.com/products/flashplayer/distribution3.html In the first table, look for the row for "plugin-based browsers" and you can use either the EXE or the MSI installer. To ensure that the old version is removed, please close any tabs that are using Flash, or exit out of Firefox, during the update. Success? Can you play?