Huge bug fix. (The track information wasn't updating at all, even though commands like toggle/skip/prev/adding to favorite/repeat/shuffle were working.)
bba13a6
Got rid of browser-polyfill.js. Had to do it because I couldn't figure out why it's bugging with this. I'm not sure why all the sudden it stopped its visualization. However, I assume that the communication between the sc tab and the popup isn't working properly. Even the popup sent a message to the tab, it's not responding at all, which as a result causing it not to be showing any track information. By removing browser-polyfill.js and adjusting a few codes...
I left a few notes on content.js and contents/utils.js. Just in case...
bba13a6#r141670937 , bba13a6#r141670956
Ultimately, it became so slow. Sadge. It is what it is. I apologize for inconvenience though. But I'm busy. I fixed the bug anyway. I'll do it in the Summer vacation tho lol ._.