It only sounds insane because you're saying "want extensions to snoop" to describe "want extensions to run a function call locally".
It is a permission that could be used by a malicious extension to snoop, but that is far from the only use. Wanting the permission != wanting snooping.
It is a permission that could be used by a malicious extension to snoop, but that is far from the only use. Wanting the permission != wanting snooping.