Bug 1003993 - FxA System app - remove refs to 'accountId', replace with 'email'. r=ferjm
Bug 1004099 - FxA Settings app - remove refs to 'accountId', replace with 'email'. r=arthurcc
Bug 1000132 - [Building Blocks] Split headers.css to demo @import
Bug 1007147 - Fit visual details to icons label
Bug 1006133 - [Messages] Add tests for UI message deletion. r=azasypkin
Merge pull request #18961 from DouglasSherk/1006133-sms-deletion-tests

Bug 1006133 - [Messages] Add tests for UI message deletion. r=azasypkin
Merge pull request #18839 from 6a68/bug-1003993-fxa-systemapp-remove-accountId

Bug 1003993 - FxA System app - remove refs to 'accountId', replace with 'email'
Merge pull request #18840 from 6a68/bug-1004099-fxa-settingsapp-remove-accountId

Bug 1004099 - FxA Settings app - remove refs to 'accountId', replace with 'email'
Bug 1007845 - Fix whitespace removals from en-US locale files from bug 940512 and bug 940132
Merge pull request #18784 from rnowm/1000132

Bug 1000132 - [Building Blocks] Split headers.css to demo @import r=cyee
Merge pull request #19061 from crdlc/bug-1007147

Bug 1007147 - Fit visual details to icon's label
Merge pull request #19075 from jrburke/bug1007845-email-calendar-en-whitespace

Bug 1007845 - Fix whitespace removals from en-US locale files r=asuth,gaye
Bug 1007147 - [Home2] Follow-up, add overflow: hidden to icons to prevent x-axis panning r=me
Bug 1004768 - [Home2] Remove will-change property as it hurts scrolling performance with too many individual layers r=me