Is it possible to create a binary extension that can run on Chrome OS?

Chrome supports bi开发者_开发百科nary extensions on all platforms. But I cannot decide whether Chrome OS supports them too...

Nope, they are disabled on purpose.

See this, this, this.

They don't support NPAPI, but they do support the new native client architecture NaCL.

For more information regarding the difference:

http://dev.chromium.org/nativeclient/getting-started/getting-started-background-and-basics

If your binary extension uses PPAPI rather than NPAPI, it will definitely work on Chrome OS.