A pull request with Brian's suggested patch from https://bugzilla.mozilla.org/show_bug.cgi?id=795490
I've tested this, seems to work fine
this should be in the if statement to match byran's diff, but I'm not sure this is the best way to go yet anyhow.
fix for bug #795490 - panel.contentURL change doesn't swap out the vi…
…sible page in a panel
@Gozala @erikvold as discussed today in triage, I updated this pull request for merge.
I'm working on getting tree back to green, I'd love to defer landing this until tree is green.
Sounds good to me!