doesn't work on spotify

Version 2.5.2 - all media keys work as play\pause on google play music. Also it's a bit annoying, if I have VK and Google Play Music opened at the same time (both tabs are opened), VK receives the commands.

it works pretty good but frequently i'll pause a you tube video and then come back an hour or so later and when i press play again it starts but then immediately pauses. this doesn't occur with other plugins alike... it does work on a complete different browser lets say you opened fire fox opened youtube then played a video then minimized it opened a whole new firefox window and went shopping opened 4 tabs and then decide you want to pause the music it did work to pause from that window while youtube was minimized so that much was awsome i just wish it worked while everything was minimized.

Play/Pause Works, but only when Firefox is selected. Forward and Backward don't work at all.

The Skipping buttons doesnt work, all it does is pause the videos.

It doesn't use global hotkeys like it claimed (at least thats what i understood)
On spotify, the forward, play/pause, previous, all these just does the same as play/pause.