Control Google Play Music with a browser extension.
I love music, I really do. I also love coding and the two together are a little like Strawberries and Cream, Chocolate and Cherries, Cheese and Pineapple, Rhubarb and Custard or Marmite and Cheese (Hey, before you start: some people who hate Marmite like Marmite and Cheese on toast... or Marmite, Peanut Butter, Coleslaw and Cheese on toast (YUM)).
Sometimes other things get in the way though and I'll need to drag myself away from the coding and music fairies to talk to someone, go to a meeting or attend a scrum... in the meantime I've got more tabs open than God and I can't find the Google Music tab for love nor money. What I needed was a simple button that just pauses and plays Google Music - so I made one!
I thought that others might want the same thing - here you go.
UPDATE - fixed an issue with chrome.browserAction.enable()