Dropping permissions and sandboxing a browser plugin.

Hi! I've been requested to write an existing game as a web plugin..
I've been researching into this and, while writting a plugin seems to
be very straightforward, i'm very worried about the security issues,
potential vulnerabilities, etc.
How do existing web plugin engines such as Unity handle this threat to
avoid exploits? (if they do at all?)

So far, If i got it right, it seems as the proper thing to do is to
drop process permissions to minimize the risk, but i can't really find
a lot of information/documentation about sandboxing or any third party
library that one can use or licence in order to do this. Information
on this would be very appreciated!

Juan Linietsky
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