Bug 833042 - Consuming promises first example doesn't make sense
updated 'Using Port' to include removeListener() and once()
Merge pull request #759 from wbamberg/810656

Fix Bug 810656: updated 'Using Port' content script documentation to include removeListener() and once() r=@erikvold
Merge pull request #743 from ochameau/fix-promise-doc@833042

Bug 833042 - Consuming promises first example doesn't make sense r=@gozala
Bug 833870 - Avoid hacking document style when translating html files.
Merge pull request #739 from ochameau/l10n-stylesheet

Bug 833870 - Avoid hacking document style when translating html files. r=@ZER0
Bug 831933: Force focus the active window so the focus manager knows what is going on. r=ochameau