Which browsers support Object.observe?

You can use kangax’s Browser Compatibility Table for Object.observe

It is part of ECMA Script 7 Specifications, it seems. Luckily, at the time of this writing, my current browser, Chrome 33, is the only one which supports it 🙂

If you like to enable it in Chrome 33,

1. Visit chrome://flags/

2. And enable Enable Experimental JavaScript