Why do I have to install an extension to share my screen?

The reason you have to install an extension is that Chrome wants to increase the security around allowing websites to capture the contents of your screen. The appear.in screen sharing extension only gives appear.in permission to capture your screen, but only when you have given explicit permission by clicking the “Share screen” button and confirming by selecting an application window. With Firefox, appear.in is on a whitelist of sites that are approved to use screen sharing. 

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