Ah. That is something else- a security feature. As I said, Flash has a long/sad history of being abused by malware. It is being phased out over time and web sites are switching to HTML5 for animations instead. A while (a month?) ago, Firefox added a feature that by default would block Flash animations , but would ask you if you wanted to run them one-time or always allow that site to run Flash. The need will eventually disappear, but some will find it annoying. You can: (a) allow the Flash to be blocked if there isn't anything on the page that you can't live without (like an ad), (b) allow the Flash to run for that one visit, or (c) whitelist that site so that it can continue to display Flash without prompting you again. There is almost certainly a hidden setting to disable that feature entirely, but I don't recommend using that route. The fewer Flash animations that run in your browser, the less chance you will get hit by malware.