diff --git a/js/src/frontend/BytecodeEmitter.cpp b/js/src/frontend/BytecodeEmitter.cpp
index aed05cca63e..f62f568fc93 100644
--- a/js/src/frontend/BytecodeEmitter.cpp
+++ b/js/src/frontend/BytecodeEmitter.cpp
@@ -3436,8 +3436,6 @@ EmitVariables(ExclusiveContext *cx, BytecodeEmitter *bce, ParseNode *pn, VarEmit
 
     ParseNode *next;
     for (ParseNode *pn2 = pn->pn_head; ; pn2 = next) {
-        if (!UpdateSourceCoordNotes(cx, bce, pn2->pn_pos.begin))
-            return false;
         next = pn2->pn_next;
 
         ParseNode *pn3;
@@ -5906,9 +5904,6 @@ EmitObject(ExclusiveContext *cx, BytecodeEmitter *bce, ParseNode *pn)
     }
 
     for (ParseNode *pn2 = pn->pn_head; pn2; pn2 = pn2->pn_next) {
-        if (!UpdateSourceCoordNotes(cx, bce, pn2->pn_pos.begin))
-            return false;
-
         /* Emit an index for t[2] for later consumption by JSOP_INITELEM. */
         ParseNode *pn3 = pn2->pn_left;
         bool isIndex = false;
@@ -6070,8 +6065,6 @@ EmitArray(ExclusiveContext *cx, BytecodeEmitter *bce, ParseNode *pn, uint32_t co
     if (nspread && !EmitNumberOp(cx, 0, bce))
         return false;
     for (atomIndex = 0; pn2; atomIndex++, pn2 = pn2->pn_next) {
-        if (!UpdateSourceCoordNotes(cx, bce, pn2->pn_pos.begin))
-            return false;
         if (pn2->isKind(PNK_ELISION)) {
             if (Emit1(cx, bce, JSOP_HOLE) < 0)
                 return false;
@@ -6379,8 +6372,6 @@ frontend::EmitTree(ExclusiveContext *cx, BytecodeEmitter *bce, ParseNode *pn)
       case PNK_COMMA:
       {
         for (ParseNode *pn2 = pn->pn_head; ; pn2 = pn2->pn_next) {
-            if (!UpdateSourceCoordNotes(cx, bce, pn2->pn_pos.begin))
-                return false;
             if (!EmitTree(cx, bce, pn2))
                 return false;
             if (!pn2->pn_next)
diff --git a/js/src/jit-test/tests/debug/Object-deleteProperty-error-02.js b/js/src/jit-test/tests/debug/Object-deleteProperty-error-02.js
index 5b949ec8fe5..aecfa52a9a4 100644
--- a/js/src/jit-test/tests/debug/Object-deleteProperty-error-02.js
+++ b/js/src/jit-test/tests/debug/Object-deleteProperty-error-02.js
@@ -8,7 +8,11 @@ dbg.onDebuggerStatement = function (frame) {
         assertEq(exc.message, "diaf");
         assertEq(exc.fileName, "fail");
         assertEq(exc.lineNumber, 4);
-        assertEq(exc.columnNumber, 20);
+
+        // Arrant nonsense?  Sure -- but different from lineNumber is all this
+        // test exists to verify.  If you're the person to make column numbers
+        // actually work, change this accordingly.
+        assertEq(exc.columnNumber, 0);
         return;
     }
     throw new Error("deleteProperty should throw");
diff --git a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-01.js b/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-01.js
index 50c38dffe1c..aca6f14f93e 100644
--- a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-01.js
+++ b/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-01.js
@@ -16,4 +16,4 @@ Debugger(global).onDebuggerStatement = function (frame) {
 global.log = '';
 global.eval("function f(n) { for (var i = 0; i < n; ++i) log += '. '; log += '! '; } debugger;");
 global.f(3);
-assertEq(global.log, "25 32 44 . 39 32 44 . 39 32 44 . 39 32 57 ! 69 ");
+assertEq(global.log, "21 32 44 . 39 32 44 . 39 32 44 . 39 32 57 ! 69 ");
diff --git a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-02.js b/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-02.js
deleted file mode 100644
index 4a4480f4c98..00000000000
--- a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-02.js
+++ /dev/null
@@ -1,21 +0,0 @@
-// getColumnOffsets correctly places multiple variable declarations.
-
-var global = newGlobal();
-Debugger(global).onDebuggerStatement = function (frame) {
-    var script = frame.eval("f").return.script;
-    script.getAllColumnOffsets().forEach(function (offset) {
-        script.setBreakpoint(offset.offset, {
-            hit: function (frame) {
-                assertEq(offset.lineNumber, 1);
-                global.log += offset.columnNumber + " ";
-            }
-        });
-    });
-};
-
-global.log = '';
-global.eval("function f(n){var w0,x1=3,y2=4,z3=9} debugger;");
-global.f(3);
-
-// Should have hit each variable declared.
-assertEq(global.log, "18 21 26 31 33 ");
diff --git a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-03.js b/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-03.js
deleted file mode 100644
index 1019f0cdfaf..00000000000
--- a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-03.js
+++ /dev/null
@@ -1,20 +0,0 @@
-// getColumnOffsets correctly places comma separated expressions.
-
-var global = newGlobal();
-Debugger(global).onDebuggerStatement = function (frame) {
-    var script = frame.eval("f").return.script;
-    script.getAllColumnOffsets().forEach(function (offset) {
-        script.setBreakpoint(offset.offset, {
-            hit: function (frame) {
-                assertEq(offset.lineNumber, 1);
-                global.log += offset.columnNumber + " ";
-            }
-        });
-    });
-};
-
-global.log = '';
-global.eval("function f(n){print(n),print(n),print(n)} debugger;");
-global.f(3);
-// Should hit each call that was separated by commas.
-assertEq(global.log, "14 23 32 40 ");
diff --git a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-04.js b/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-04.js
deleted file mode 100644
index dfc9c176f11..00000000000
--- a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-04.js
+++ /dev/null
@@ -1,20 +0,0 @@
-// getColumnOffsets correctly places object properties.
-
-var global = newGlobal();
-Debugger(global).onDebuggerStatement = function (frame) {
-    var script = frame.eval("f").return.script;
-    script.getAllColumnOffsets().forEach(function (offset) {
-        script.setBreakpoint(offset.offset, {
-            hit: function (frame) {
-                assertEq(offset.lineNumber, 1);
-                global.log += offset.columnNumber + " ";
-            }
-        });
-    });
-};
-
-global.log = '';
-global.eval("function f(n){var o={a:1,b:2,c:3}} debugger;");
-global.f(3);
-// Should hit each property in the object.
-assertEq(global.log, "18 21 25 29 19 ");
diff --git a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-05.js b/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-05.js
deleted file mode 100644
index 8e9bcb3b36e..00000000000
--- a/js/src/jit-test/tests/debug/Script-getAllColumnOffsets-05.js
+++ /dev/null
@@ -1,20 +0,0 @@
-// getColumnOffsets correctly places array properties.
-
-var global = newGlobal();
-Debugger(global).onDebuggerStatement = function (frame) {
-    var script = frame.eval("f").return.script;
-    script.getAllColumnOffsets().forEach(function (offset) {
-        script.setBreakpoint(offset.offset, {
-            hit: function (frame) {
-                assertEq(offset.lineNumber, 1);
-                global.log += offset.columnNumber + " ";
-            }
-        });
-    });
-};
-
-global.log = '';
-global.eval("function f(n){var a=[1,2,3]} debugger;");
-global.f(3);
-// Should hit each item in the array.
-assertEq(global.log, "18 21 23 25 19 ");