No bug - Tagging 6c4a098b52dc0a793b55f2fb2894b80892873e2f with FIREFOX_77_0_BUILD2 a=release CLOSED TREE DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D76859

Differential Revision: https://phabricator.services.mozilla.com/D76155

No bug - Tagging 69ca1d06f46ad976113938e6dfccfeb7315ee7a6 with FIREFOX_77_0_BUILD1 a=release CLOSED TREE DONTBUILD

No bug - tagging 109871b2551e8e28dfa311bced65057542c91388 with FIREFOX_RELEASE_76_END a=release DONTBUILD CLOSED TREE

Merge old head via |hg debugsetparents cf5de4cbb547a5e64ba7d688bd57ff486064b17f 109871b2551e8e28dfa311bced65057542c91388| CLOSED TREE DONTBUILD a=release

No bug - tagging 63896e87d70e6d0323efba7d51f1ee2d7df21b69 with FIREFOX_RELEASE_77_BASE a=release DONTBUILD CLOSED TREE

Differential Revision: https://phabricator.services.mozilla.com/D76299

Differential Revision: https://phabricator.services.mozilla.com/D76111

Bug 1638173 - Setup WNP for users coming from <77.0 and receiving the 77.0 release: Add en-US to locale list for release. a=jcristau-on-Slack

Differential Revision: https://phabricator.services.mozilla.com/D76654

This effectively reverts bug 1621804.

Differential Revision: https://phabricator.services.mozilla.com/D76488

Differential Revision: https://phabricator.services.mozilla.com/D75772

Updates the Fathom model to improve recognition of password input fields for the password manager.

Testing results:

Site                        || Training Result* || My Result

icoadm.in                   || Partial          || Success
sogou.com                   ||                  || Success
nfpa.org                    || Partial          || Success
facebook.com recovery form  || Success          || Fail (Fathom not called)
vk.com                      ||                  || Fail (Fathom not called)
perfumania.com              || Partial          || Fail (Fathom not called)
zoom.us                     ||                  || Partial (Password: .5207, Confirm: .9996)
sohu.com                    ||                  || Fail (.5207)
weibo.com                   ||                  || Fail (.5207)
facebook.com change form    || Success          || Partial (Password: .3350, Confirm: .7748)
DigiFinex                   || Partial          || Partial (Password: .3451, Confirm: .8146)
zhanqi.tv                   ||                  || Fail (.2148)
twitter.com                 ||                  || Fail (.0426)

* taken from the commit message of https://github.com/mozilla-services/fathom-login-forms/commit/368cbce234fcd2804f82d88d10ac940b8243c496

Differential Revision: https://phabricator.services.mozilla.com/D75452

Differential Revision: https://phabricator.services.mozilla.com/D75450

Differential Revision: https://phabricator.services.mozilla.com/D74676

Differential Revision: https://phabricator.services.mozilla.com/D75275

Differential Revision: https://phabricator.services.mozilla.com/D74630

Differential Revision: https://phabricator.services.mozilla.com/D74462

Setup WNP for users coming from <77.0 and receiving the 77.0 release

Differential Revision: https://phabricator.services.mozilla.com/D76498

Differential Revision: https://phabricator.services.mozilla.com/D76249

No bug - Tagging b56c5586464ad74e5c980e38fba121705ffcc65c with FIREFOX_77_0b9_RELEASE a=release CLOSED TREE DONTBUILD

No bug - Tagging b56c5586464ad74e5c980e38fba121705ffcc65c with DEVEDITION_77_0b9_RELEASE a=release CLOSED TREE DONTBUILD

No bug - Tagging b56c5586464ad74e5c980e38fba121705ffcc65c with FIREFOX_77_0b9_BUILD1 a=release CLOSED TREE DONTBUILD

No bug - Tagging b56c5586464ad74e5c980e38fba121705ffcc65c with DEVEDITION_77_0b9_BUILD1 a=release CLOSED TREE DONTBUILD

Bug 1538537 - When suppressing anchoring on an scrollframe, forward to the frame that actually maintains the anchor as needed. r=dholbert, a=RyanVM

The test-case is position-change-heuristic.html but with body and #space
having overflow: hidden, which makes it fail on Nightly.

Differential Revision: https://phabricator.services.mozilla.com/D75825

Bug 1630229: Part 8 - Stop throwing AssertionError for binding of defunct ServiceAllocator.InstanceInfo; r=geckoview-reviewers,owlish a=RyanVM

I'm keeping this patch as simple as possible so that we can uplift to beta.
I'll sort out the rest of this in follow-up bugs.

Differential Revision: https://phabricator.services.mozilla.com/D76333

Bug 1632644 - Allow PDF attachments to, once again, be opened directly in the browser. r=bdahl, a=RyanVM

Backport of upstream commit https://github.com/mozilla/pdf.js/commit/0960e6c0b5f2bdb45b8f4d280a3353ed230f448a

Differential Revision: https://phabricator.services.mozilla.com/D76200

Differential Revision: https://phabricator.services.mozilla.com/D75305

Differential Revision: https://phabricator.services.mozilla.com/D75119

Differential Revision: https://phabricator.services.mozilla.com/D76213

This corrects the handling of user-scalable=no to first clamp scale (whether
specified or default) between min and max scales, then applies the resulting
value to initial-scale, min and max.

Differential Revision: https://phabricator.services.mozilla.com/D76056

Bug 1636740 - Block CMemStream::Read only if the drop target initiated an async operation. r=aklotz, a=pascalc

If the drop target did not initiate an async operation, `DoDragDrop` will
block on the main thread until the data transfer completes. Although the
`ObtainCachedIconFile` callback itself will run off the main thread,
`ObtainCachedIconFile` will end up with calling `NotifyIconObservers` that
heavily relies on the main thread. So `ObtainCachedIconFile` will have no
chance to run the callback.

To complete the data transfer, however, the `ObtainCachedIconFile` callback
must signal the event object to unblock `CMemStream::Read`. Deadlock.

Differential Revision: https://phabricator.services.mozilla.com/D75531

Bug 1580390 - fix sync IPC whitelist entries for PLayerTransaction::Msg_GetTextureFactoryIdentifier, PCompositorBridge::Msg_Initialize and PCompositorWidget::Msg_Initialize, r=emalysz a=test-only

Differential Revision: https://phabricator.services.mozilla.com/D75103

Bug 1639108: Use the end offset for e10s IAccessibleText::newText instead of the length. r=eeejay, a=pascalc

Previously, we were incorrectly using the length.

Differential Revision: https://phabricator.services.mozilla.com/D75897

Differential Revision: https://phabricator.services.mozilla.com/D75215