Unfortunately it doesn't work well on OS X and still requires me to run Chrome in background next to the Firefox leading to alot of annoying horrible window switching issues (for some reason chrome apps tend to get stuck in background when alt-tabbing, sometimes it just hangs, burns alot of memory for a really simple interface....)

All those "web apps" that were meant to be coming to the desktop and the flurry of excitement when browsers started adding the ability to add shortcuts on the desktop to a "web app" seems to have died down, and with good reason I think! Some people don't want to be sat with a browser open all day. Given that browsers are turning into mini-OSes themselves, it's irritating as they don't fit into the OS window management system easily (like awkward popups/alerts).