Bug 888150 - [MMS][Regression] Header actions are not working properly.

- STR1 Fixed
- STR2 Cannot Reproduce (https://www.dropbox.com/sh/3lr5a5kepnns8z1/rydxqmpucg)
- STR3 Fixed

https://bugzilla.mozilla.org/show_bug.cgi?id=888150
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>