Bug 927862 - Implement AttentionWindow
Bug 885110 - [email] Switch to email.js libraries. r=asuth r=jrburke r=mcav
Merge pull request #23232 from mcav/emailjs

Bug 885110 - Switch to email.js libraries. r=asuth r=jrburke r=mcav
Merge pull request #22913 from alivedise/attention-window-final

Bug 927862 - Implement AttentionWindow, r=etienne