This might not take effect until all Flash has been unloaded for a few minutes, or you close Firefox. (C) Double-click the .disable-protected-mode preference to switch its value from false to true. (B) In the search box above the list, type or paste flash and pause while the list is filtered Click the button promising to be careful. (A) In a new tab, type or paste about:config in the address bar and press Enter. The protected mode feature of the Flash player plugin has security benefits, but seems to have compatibility issues on some systems. (3) Disable protected mode (Windows Vista and higher) More information in this support article from Adobe: (B) In Flash, right-click the media and choose Settings, then the first mini-tab and uncheck the box to use hardware acceleration. That takes effect the next time you exit and start Firefox up again. "3-bar" menu button (or Tools menu) > Options > Advanced > General > "Use hardware acceleration when available" (2) Disable hardware acceleration in Firefox and in Flash (1) If you have any recorders/downloaders that interact with Flash media make sure they are as up-to-date as possible, or disable them temporarily. It might partially duplicate the above, but just in case: This is some standard guidance that addresses the most common issues with the Flash Player plugin. ActiveX is for IE and possibly for some desktop applications that embed Flash.
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