Firefox & kmail OT

Hello kind, gentle, & understanding SuSE users, This is definitely OT but rather than subscribe to yet another mailing list, I thought that some kind soul here would provide me with the answer. I somehow managed to lose the feature in firefox, that when you click on an email address in a page, it opens a mail for you to compose and send. This happened to me once before in an earlier version of Firefox but for the life of me I don't remember how I fixed it. Bob S.