I have nightly installed too, and when you go to ruffles download page, just click on firefox link and you get a popup who ask you to install the extention, the same with chrome.
It seem like this game is made like it embed the game from Gamepix and then there is made a js file who do the score submit, this mean that all files the game are using have to fetch all files from other sites like Arcade2013 say, and that could be a problem for some to do that, special if they have some sort of protection for add's.
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An issue has been reported with Jelly Matching
in Game Reports
Posted
@Legionaire
This one work
jellymatching_Origon.tar