diff --git a/dom/imptests/failures/editing/conformancetest/test_runtest.html.json b/dom/imptests/failures/editing/conformancetest/test_runtest.html.json
index 71fbcb430678..2b0858111825 100644
--- a/dom/imptests/failures/editing/conformancetest/test_runtest.html.json
+++ b/dom/imptests/failures/editing/conformancetest/test_runtest.html.json
@@ -3869,6 +3869,7 @@
   "[[\"stylewithcss\",\"false\"],[\"defaultparagraphseparator\",\"p\"],[\"inserthorizontalrule\",\"\"]] \"<p>foo<b>b[a]r</b>baz</p>\" queryCommandValue(\"defaultparagraphseparator\") after":true,
   "[[\"inserthorizontalrule\",\"\"]] \"<address>foo[bar]baz</address>\" compare innerHTML":true,
   "[[\"inserthorizontalrule\",\"\"]] \"<bdi>foo[bar]baz</bdi>\" compare innerHTML":true,
+  "[[\"inserthorizontalrule\",\"\"]] \"<blink>foo[bar]baz</blink>\" compare innerHTML":true,
   "[[\"inserthorizontalrule\",\"\"]] \"<table><caption>foo[bar]baz</caption><tr><td>quz</table>\": execCommand(\"inserthorizontalrule\", false, \"\") return value":true,
   "[[\"inserthorizontalrule\",\"\"]] \"<table><caption>foo[bar]baz</caption><tr><td>quz</table>\" compare innerHTML":true,
   "[[\"inserthorizontalrule\",\"\"]] \"<dl><dt>foo[bar]baz</dt></dl>\" compare innerHTML":true,
@@ -11044,8 +11045,6 @@
   "[[\"outdent\",\"\"]] \"<blockquote><span>foo<br>[bar]</span></blockquote>\" compare innerHTML":true,
   "[[\"stylewithcss\",\"true\"],[\"removeformat\",\"\"]] \"foo<b id=foo>b[a]r</b>baz\" compare innerHTML":true,
   "[[\"stylewithcss\",\"false\"],[\"removeformat\",\"\"]] \"foo<b id=foo>b[a]r</b>baz\" compare innerHTML":true,
-  "[[\"removeformat\",\"\"]] \"[foo<blink>bar</blink>baz]\" compare innerHTML":true,
-  "[[\"removeformat\",\"\"]] \"foo<blink>b[a]r</blink>baz\" compare innerHTML":true,
   "[[\"removeformat\",\"\"]] \"[foo<del>bar</del>baz]\" compare innerHTML":true,
   "[[\"removeformat\",\"\"]] \"foo<del>b[a]r</del>baz\" compare innerHTML":true,
   "[[\"removeformat\",\"\"]] \"[foo<nobr>bar</nobr>baz]\" compare innerHTML":true,
diff --git a/editor/libeditor/base/nsEditPropertyAtomList.h b/editor/libeditor/base/nsEditPropertyAtomList.h
index 1316a0e6a910..6cc270463136 100644
--- a/editor/libeditor/base/nsEditPropertyAtomList.h
+++ b/editor/libeditor/base/nsEditPropertyAtomList.h
@@ -31,7 +31,6 @@ EDITOR_ATOM(aside, "aside")
 EDITOR_ATOM(b, "b")
 EDITOR_ATOM(bdo, "bdo")
 EDITOR_ATOM(big, "big")
-EDITOR_ATOM(blink, "blink")
 EDITOR_ATOM(blockquote, "blockquote")
 EDITOR_ATOM(body, "body")
 EDITOR_ATOM(br, "br")
diff --git a/editor/libeditor/html/nsHTMLEditUtils.cpp b/editor/libeditor/html/nsHTMLEditUtils.cpp
index c7d819b6b031..179ace18a579 100644
--- a/editor/libeditor/html/nsHTMLEditUtils.cpp
+++ b/editor/libeditor/html/nsHTMLEditUtils.cpp
@@ -59,7 +59,6 @@ nsHTMLEditUtils::IsInlineStyle(nsINode* aNode)
       || (nodeAtom == nsEditProperty::strike)
       || (nodeAtom == nsEditProperty::big)
       || (nodeAtom == nsEditProperty::small)
-      || (nodeAtom == nsEditProperty::blink)
       || (nodeAtom == nsEditProperty::sub)
       || (nodeAtom == nsEditProperty::sup)
       || (nodeAtom == nsEditProperty::font);
@@ -629,7 +628,6 @@ static const nsElementInfo kElements[eHTMLTag_userdefined] = {
   ELEM(bdo, true, true, GROUP_SPECIAL, GROUP_INLINE_ELEMENT),
   ELEM(bgsound, false, false, GROUP_NONE, GROUP_NONE),
   ELEM(big, true, true, GROUP_FONTSTYLE, GROUP_INLINE_ELEMENT),
-  ELEM(blink, false, false, GROUP_NONE, GROUP_NONE),
   ELEM(blockquote, true, true, GROUP_BLOCK, GROUP_FLOW_ELEMENT),
   ELEM(body, true, true, GROUP_TOPLEVEL, GROUP_FLOW_ELEMENT),
   ELEM(br, false, false, GROUP_SPECIAL, GROUP_NONE),
diff --git a/editor/txtsvc/src/nsTSAtomList.h b/editor/txtsvc/src/nsTSAtomList.h
index 7ec7c7206c40..7ba769339b56 100644
--- a/editor/txtsvc/src/nsTSAtomList.h
+++ b/editor/txtsvc/src/nsTSAtomList.h
@@ -26,7 +26,6 @@
 TS_ATOM(sAAtom, "a")
 TS_ATOM(sAddressAtom, "address")
 TS_ATOM(sBigAtom, "big")
-TS_ATOM(sBlinkAtom, "blink")
 TS_ATOM(sBAtom, "b")
 TS_ATOM(sCiteAtom, "cite")
 TS_ATOM(sCodeAtom, "code")
diff --git a/editor/txtsvc/src/nsTextServicesDocument.cpp b/editor/txtsvc/src/nsTextServicesDocument.cpp
index 9f2106e19846..5ec01d09df0e 100644
--- a/editor/txtsvc/src/nsTextServicesDocument.cpp
+++ b/editor/txtsvc/src/nsTextServicesDocument.cpp
@@ -2292,7 +2292,6 @@ nsTextServicesDocument::IsBlockNode(nsIContent *aContent)
   return (sAAtom       != atom &&
           sAddressAtom != atom &&
           sBigAtom     != atom &&
-          sBlinkAtom   != atom &&
           sBAtom       != atom &&
           sCiteAtom    != atom &&
           sCodeAtom    != atom &&
diff --git a/editor/txtsvc/src/nsTextServicesDocument.h b/editor/txtsvc/src/nsTextServicesDocument.h
index be1883be308a..7fa0e6eeadd3 100644
--- a/editor/txtsvc/src/nsTextServicesDocument.h
+++ b/editor/txtsvc/src/nsTextServicesDocument.h
@@ -39,7 +39,6 @@ private:
   static nsIAtom *sAAtom;
   static nsIAtom *sAddressAtom;
   static nsIAtom *sBigAtom;
-  static nsIAtom *sBlinkAtom;
   static nsIAtom *sBAtom;
   static nsIAtom *sCiteAtom;
   static nsIAtom *sCodeAtom;