* requires NSPR 4.12 / NSS 3.21.1
* Instant browser tab sharing through Hello
* Synced Tabs button in button bar
* Tabs synced via Firefox Accounts from other devices are now shown
in dropdown area of Awesome Bar when searching
* Introduce a new preference (network.dns.blockDotOnion) to allow
blocking .onion at the DNS level
* Tab Groups (Panorama) feature removed
OBS-URL: https://build.opensuse.org/package/show/mozilla:Factory/MozillaFirefox?expand=0&rev=490
