Display exclusive region message if present (bug 945997)

https://bugzilla.mozilla.org/show_bug.cgi?id=945997

**Screenshots:**
![screen shot 2013-12-03 at 16 16 44](https://f.cloud.github.com/assets/187006/1715173/cd181eca-61ae-11e3-828a-5a1e0773e8a2.png)
![screen shot 2013-12-03 at 16 16 26](https://f.cloud.github.com/assets/187006/1715174/cd19f2ea-61ae-11e3-8683-15399d5ee89c.png)