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Notch uses social spy to know what players of Minecraft are doing and how they use Minecraft. It will, for example, show if your playing from a browser or from the client and other minute details such as this.
If you want to play Minecraft in your web browser, you will have to install Java on your computer. Java usually comes with browser plugins that can be used to run Java apps such as Minecraft in your browser. You can download Java from Java's website.
Go to Minecraft.net, log in using an account that had bought Minecraft and then click play in your browser under the Download Now! button on the main page. If you do not have an account that has paid for Minecraft then you can play Minecraft Classic for free.
You can play Minecraft Classic for free in a browser, at the Minecraft webpage.
You can play it in browser.