Bug 1785507 - Update expectations for 2d.drawImage.animated.poster.html due to frequent failures. r=aryx DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D170276

fur -> 09156838c92b682963eff422c2e4de6242f05cab
kab -> 7c07bb8f7233ea92767f7e31645a8d2f84d4ab37
lt -> 4b469b13e48954beac82ad3b53ede20136ca08b7
nn-NO -> 362bd05fb2fafe4160f46de866e82b19965c025a
tg -> 2ae48acf1d2f3a327be44935b3494187e3b427d0

Differential Revision: https://phabricator.services.mozilla.com/D170273

Bug 1812560 - Allow mach doc to build subdirectories of doc r=firefox-source-docs-reviewers,ahal DONTBUILD

Depends on D169094

Differential Revision: https://phabricator.services.mozilla.com/D170075

Backed out changeset 07c689de250c (bug 1812868)
Backed out changeset e7d370501c50 (bug 1812868)

lo -> df2b683da20edd012b2744a11ab7e8b0117e95e2

Differential Revision: https://phabricator.services.mozilla.com/D170230

Now only the owning thread should ever call it.

Differential Revision: https://phabricator.services.mozilla.com/D170207

This removes mutex and locks from BodyStream.

Differential Revision: https://phabricator.services.mozilla.com/D170089

Nobody sets -moz-image-region on macOS anyways, remove the dead code.

Differential Revision: https://phabricator.services.mozilla.com/D170008

Differential Revision: https://phabricator.services.mozilla.com/D165924

Differential Revision: https://phabricator.services.mozilla.com/D170266

Differential Revision: https://phabricator.services.mozilla.com/D170265

Backed out 5 changesets (bug 1813011, bug 1816718) for causing wpt failures on fetch-event-respond-with-partial-stream.https.html. CLOSED TREE

Backed out changeset dbc816fbc0d1 (bug 1813011)
Backed out changeset 7a10fc19c41c (bug 1813011)
Backed out changeset acb4e003bfae (bug 1813011)
Backed out changeset 5505e602d7cf (bug 1816718)
Backed out changeset 9ecb2bb2b93e (bug 1816718)

Backed out 11 changesets (bug 1817308, bug 1817311, bug 1817317, bug 1817310, bug 1817309, bug 1817314, bug 1817316, bug 1817318, bug 1817313, bug 1817312, bug 1817315) for causing hybrid bustage on WrapperFactory.cpp. CLOSED TREE

Backed out changeset 1fb2fdbeecec (bug 1817308)
Backed out changeset 7153cb681119 (bug 1817309)
Backed out changeset 44e4198e2cdc (bug 1817310)
Backed out changeset ef9b097a07c4 (bug 1817311)
Backed out changeset e6f4e9a4cfc6 (bug 1817312)
Backed out changeset 4fa0b794c1e1 (bug 1817313)
Backed out changeset 13841a7b93a6 (bug 1817314)
Backed out changeset af16df862459 (bug 1817315)
Backed out changeset a157a7c3146f (bug 1817316)
Backed out changeset f9048fa7e1d9 (bug 1817317)
Backed out changeset 10219437a634 (bug 1817318)

Bug 1817307 - make sure PiP is moveable when hovering over bottom controls gradient r=pip-reviewers,mhowell

Differential Revision: https://phabricator.services.mozilla.com/D170256

Differential Revision: https://phabricator.services.mozilla.com/D170130

Differential Revision: https://phabricator.services.mozilla.com/D170129

Differential Revision: https://phabricator.services.mozilla.com/D170127

Bug 1817311 - Make toolkit/components/startup buildable outside of a unified build environment r=andi

Depends on D170125

Differential Revision: https://phabricator.services.mozilla.com/D170126

Depends on D170124

Differential Revision: https://phabricator.services.mozilla.com/D170125

Depends on D170123

Differential Revision: https://phabricator.services.mozilla.com/D170124

Depends on D170122

Differential Revision: https://phabricator.services.mozilla.com/D170123

Bug 1817315 - Make toolkit/components/printingui buildable outside of a unified build environment r=andi

Depends on D170121

Differential Revision: https://phabricator.services.mozilla.com/D170122

Depends on D170120

Differential Revision: https://phabricator.services.mozilla.com/D170121

Depends on D170119

Differential Revision: https://phabricator.services.mozilla.com/D170120

Differential Revision: https://phabricator.services.mozilla.com/D170119

Bug 1783536 - Prevent document.cookie de-sync from cookie jar when setting secure cookies. r=dveditz,necko-reviewers

Secure cookie names are now sent to insecure-origin content processes so they are
able to prevent cookie setting when there is a pre-existing secure cookie
on another process. This will prevent each content process document.cookie from
getting de-synchronized from the cookie jar.

Differential Revision: https://phabricator.services.mozilla.com/D157537

Bug 1817426 - stop limiting toggling of 'needsgutter' attribute so Windows non-native menus with checkboxes look good on Win7/8, r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D170199

Differential Revision: https://phabricator.services.mozilla.com/D170237

Bug 1817320 - Put mochitest manifest files under browser/base/content/test into alphabetical order. r=kcochrane

Differential Revision: https://phabricator.services.mozilla.com/D170244

For that we need to:

 * Make GetDPIRatioForScrollbarPart thread-safe: This was using the
   widget for bug 1727289, but just looking at the print preview scale
   is enough to fix that.

 * Make nsPresContext::UseOverlayScrollbars() thread-safe: We store the
   RDM pane stuff in the pres context.

The rest is pretty straight-forward.

Differential Revision: https://phabricator.services.mozilla.com/D168148

Differential Revision: https://phabricator.services.mozilla.com/D170233

Bug 1812694 - Stop using the DOMParser to update the aria-valuetext attribute when updating the progress in video controls, r=Gijs,flod.

Depends on D167992

Differential Revision: https://phabricator.services.mozilla.com/D168118

Differential Revision: https://phabricator.services.mozilla.com/D167992

Differential Revision: https://phabricator.services.mozilla.com/D153296

Bug 1782325 - mach hazards gather: validate the mozconfig eagerly r=firefox-build-system-reviewers,ahochheiden

Differential Revision: https://phabricator.services.mozilla.com/D153295