It looks to copy the same functionality the Roblox App has on their homepage, hovering over the games allow you to directly join them , instead of having to open the game in a new page and join. Only works on the Home page and not anywhere else.
+ Fixed extension + Improved the code for those who want to check the source and overall flexibility if Roblox does update their website again on a not so drastic scale
Contact me on discord to report any bugs: antealpha