Firefox 48.0 Beta 6

[Bot]

Released: Firefox 48.0 Beta 6

Changelog:
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• Bug 1271075 - Sites on the new tab page opened with middle click in e10s should have a 'referrerURI'.
• Bug 1256686 - System add-ons should have a more flexible maximum version for easier use with point releases.
• Bug 1282246 - don't use gradients with non-finite endpoints in DrawTargetSkia (beta).
• Bug 1280257 - "Breakpoints do not hit after page reload if "Show original sources" is disabled".
• Bug 1268525 - 48 branch patch: Add ping submission date to HTTP header.
• Bug 1280545 - Remove [Deprecated=PrefixedFullscreenAPI] annotations until we are ready to unprefix fullscreen API.
• Bug 1283828 - Ensure output arguments are set in GetFrameForFirstRangeStartOrLastRangeEnd if returned frame isn't nullptr.
• Bug 1280159 - Let paper type drive page size units on Windows.
• Bug 1280043 - Upgrade bzip2 to 1.0.6.
• Bug 1279494 - Fix crash in SetReferrerWithPolicy, add null check the triggeringPrincipal.
• Bug 1276062 - obtain the group creation result from PushGroupForLayer().
• Bug 1263083 - Use single-tile layer when less than half the tile size in either dimension.
• Bug 1283674 P2 Add wpt test verifying serviceWorker.controller behavior on disconnected window.
• Bug 1283674 P1 Make ServiceWorkerContainer::GetController() work gracefully when its window is disconnected.
• Bug 1283674 P0 Drop cached controlling ServiceWorker ref when ServiceWorkerContainer window is disconnect.
• Bug 1283622 - Sign devtools test addon.
• Bug 1280667 - Don't update the callback transform if the APZ repaint request was rejected by a concurrent main-thread scroll position update.
• Bug 1279224 - Remove all Sync promotions from doorhangers (beta version).
• Bug 1282214 - Make mp4parse read buffer fallible.

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