-don't trust my work (which I fully understand)
-tell me how to get this thing more trustworthy
-don't like it
-don't need it
-don't have Chrome
I think this is a very cool extension, and I use chrome. I won't use it, because while it's cool, it's not worth the potential security compromise.
As for making it more trustworthy, I'm not sure... You say there is nothing transmitted to a remote server, but if you're logging into battle.net or anything else, that is exactly transmitting to a remote server... I would suggest a version that doesn't require any sort of login...
Well that's the point: It doesn't require a login. The dependency of *.battle.net is just to look at the server status, as seen here:
Let me explain it a bit further:
Chrome Extensions have security restrictions by default, which mean that you have to ask the user for which domains the user is allowed to access remotely.
As the server status is on us.battle.net (http://us.battle.net/d3/en/status) or eu.battle.net, I'm asking for the permission to access *.battle.net.
Without the permission I would not be granted any access to the server status and no, you don't have to be logged-in in order to see that status.
Thanks for clearing up my confusion/ignorance... I'm using it now : )