Try Tripeaks Solitaire from the Arcade (https://www.docskillz.com/docs/index.php?action=arcade;sa=play;game=160)
Description: Remove all cards from the tableau by selecting open cards that are 1 higher or 1 lower in value then the open card. Click on the stock (next
card) to get a new open card.
New game to play!
After adjusting the HTML file of this game, it now works for Firefox.
You will need to clear cookies in Firefox before testing.
Now it works!