Adobe Flash Player has been discontinued and is no longer supported by Adobe as of December 31, 2020. Modern browsers, including Firefox, have also removed support for it, which affects the ability to play Flash content like games. Therefore, if Flash content is not playing, it is likely due to these changes rather than an issue with your Nvidia graphics card. You may consider finding alternative ways to play Flash games, such as using a Flash emulator like Ruffle, which can run Flash content without relying on Adobe Flash Player. Ensure that your browser extensions and settings are properly configured to allow such emulators to run.