Squid on bridged interfaces?

[Slackmaster]

Hey guys, this is my first post to the forum, it's been great reading all of your questions/answers.

I'm trying to setup squid to work through bridged interfaces, to no avail. What I'm trying to do is setup a PFsense box with 3 interfaces, a LAN, which I use for management, and bridging the WAN and OPT1 ints. I've bound squid to the WAN and OPT1 interfaces, but squid doesn't seem to cache any content. I'm thinking this is because the bridge0 interface is created when I enable bridging, and that doesn't show up in the list of interfaces to enable caching on. I do NOT have Filtering Bridge enabled.

Any idea if it is actually possible to do what I'm trying to do?

Thanks.