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Can't launch any external protocol programs (Steam, Roblox, NewgroundsPlayer, etc;)

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When trying to launch a game via Steam or the Newgrounds Player, Firefox fails to understand/open the external protocol for the program. And when trying to launch Roblox, the site thinks it isn't installed, and pressing "Play" after installing prompts nothing. I have tried all 3 with safe mode, with refreshed firefox, and even a reinstall..

If any more info is needed, I can add more.

When trying to launch a game via Steam or the Newgrounds Player, Firefox fails to understand/open the external protocol for the program. And when trying to launch Roblox, the site thinks it isn't installed, and pressing "Play" after installing prompts nothing. I have tried all 3 with safe mode, with refreshed firefox, and even a reinstall.. If any more info is needed, I can add more.
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