This settings should is on the game, but you can disable the hardware acceleration:

Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.

You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

Then perform these steps:

• Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
• In the Firefox options window click the Advanced tab, then select "General".
• In the settings list, you should find the Use hardware acceleration when available checkbox. Uncheck this checkbox.
• Now, restart Firefox and see if the problems persist.

Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:

• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

• Upgrade your graphics drivers to use hardware acceleration and WebGL

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Thank you.

Is this about the Flash game or about access settings for the Facebook website like enabling third-party cookies?

The setting for a Flash game should be found in the right-click context menu of that Flash game.

• Tools > Options > Privacy > Firefox will: "Use custom settings for history"

You can inspect and manage the permissions the domain of the currently selected tab via these steps:

• Click the "Site Identity Button" (globe/padlock) on the location bar
• Click "More Information" to open the "Page Info > Security" window

• Go to the Permissions tab (Tools > Page Info > Permissions) to check the permissions the domain of the currently selected tab