Do you want to clear the cache on your Android device or on a Windows/Mac/Linux version of Firefox? ''Android:'' Please see this article: [[Clear your browsing history and other personal data on Firefox for Android]]. You can uncheck categories of data that you do not want to clear. ''Other:'' There are a variety of methods, one of which uses the Options/Preferences page. The steps depend on your OS: Windows: "3-bar" menu button (or Tools menu) > Options > Advanced Mac: "3-bar" menu button (or Firefox menu) > Preferences > Advanced Linux: "3-bar" menu button (or Edit menu) > Preferences > Advanced On the Network mini-tab, in the "Cached Web Content" section, click the "Clear Now" button If you have a large hard drive, this might take a few minutes. ---- I'm not sure that will help with your video problem, however. Could you describe what is happening with that in more detail?