* MailExtensions: browser.tabs.sendMessage API added
* MailExtensions: messageDisplayScripts API added
* Yahoo and AOL mail users using password authentication will be
migrated to OAuth2
* MailExtensions: messageDisplay APIs extended to support multiple
selected messages
* MailExtensions: compose.begin functions now support creating a
message with attachments
* multiple bugfixes
OBS-URL: https://build.opensuse.org/package/show/mozilla:Factory/MozillaThunderbird?expand=0&rev=557
