All of these are extensions, not "apps".
Of which the only ones I use are Google Mail Checker, Chrome To Phone, WoT and AB+. I have some others too, but I don't actively use them.
ITT:Google Chrome Apps(not the extensions but the Apps) are just Links to Stuff and Firefox has more mods than Chrome(and more Powerful like Skipscreen Which skips Mediafire and megaupload Download Screens)
Actually, that would be fully possible to do with Chrome too.