Revert one of the assertion additions in Bug 1110277 patch 3 since it fires, causing orange. r=orange Example stack, from editor/libeditor/tests/browserscope/test_richtext2.html : ###!!! ASSERTION: should only call on first continuation/ib-sibling: 'nsLayoutUtils::IsFirstContinuationOrIBSplitSibling(this)', file /builds/slave/m-in-l64-d-0000000000000000000/build/src/layout/base/../generic/nsIFrame.h, line 875 #01: AdjustAppendParentForAfterContent [layout/base/nsCSSFrameConstructor.cpp:6059] #02: nsCSSFrameConstructor::ContentAppended(nsIContent*, nsIContent*, bool) [layout/base/nsCSSFrameConstructor.cpp:7155] #03: PresShell::ContentAppended(nsIDocument*, nsIContent*, nsIContent*, int) [layout/base/nsPresShell.cpp:4520] #04: nsNodeUtils::ContentAppended(nsIContent*, nsIContent*, int) [dom/base/nsNodeUtils.cpp:132] #05: nsINode::doInsertChildAt(nsIContent*, unsigned int, bool, nsAttrAndChildArray&) [dom/base/nsINode.cpp:1544] #06: nsINode::ReplaceOrInsertBefore(bool, nsINode*, nsINode*, mozilla::ErrorResult&) [dom/base/nsINode.cpp:2209] #07: mozilla::dom::NodeBinding::appendChild [obj-firefox/dom/bindings/NodeBinding.cpp:600]

--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -866,18 +866,16 @@ public:
 
   NS_DECLARE_FRAME_PROPERTY(InvalidationRect, DestroyRect)
 
   NS_DECLARE_FRAME_PROPERTY(RefusedAsyncAnimation, nullptr)
 
   NS_DECLARE_FRAME_PROPERTY(GenConProperty, DestroyContentArray)
 
   nsTArray<nsIContent*>* GetGenConPseudos() {
-    NS_ASSERTION(nsLayoutUtils::IsFirstContinuationOrIBSplitSibling(this),
-                 "should only call on first continuation/ib-sibling");
     const FramePropertyDescriptor* prop = GenConProperty();
     return static_cast<nsTArray<nsIContent*>*>(Properties().Get(prop));
   }
 
   /**
    * Return the distance between the border edge of the frame and the
    * margin edge of the frame.  Like GetRect(), returns the dimensions
    * as of the most recent reflow.