--- a/content/media/MediaDecoderStateMachine.cpp
+++ b/content/media/MediaDecoderStateMachine.cpp
@@ -1305,17 +1305,17 @@ void MediaDecoderStateMachine::SetDurati
   }
 }
 
 void MediaDecoderStateMachine::UpdateEstimatedDuration(int64_t aDuration)
 {
   AssertCurrentThreadInMonitor();
   int64_t duration = GetDuration();
   if (aDuration != duration &&
-      abs(aDuration - duration) > ESTIMATED_DURATION_FUZZ_FACTOR_USECS) {
+      std::abs(aDuration - duration) > ESTIMATED_DURATION_FUZZ_FACTOR_USECS) {
     SetDuration(aDuration);
     nsCOMPtr<nsIRunnable> event =
       NS_NewRunnableMethod(mDecoder, &MediaDecoder::DurationChanged);
     NS_DispatchToMainThread(event);
   }
 }
 
 void MediaDecoderStateMachine::SetMediaEndTime(int64_t aEndTime)

--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -2168,18 +2168,18 @@ TabChild::UpdateTapState(const WidgetTou
   if (!trackedTouch) {
     return;
   }
 
   LayoutDevicePoint currentPoint = LayoutDevicePoint(trackedTouch->mRefPoint.x, trackedTouch->mRefPoint.y);
   int64_t time = aEvent.time;
   switch (aEvent.message) {
   case NS_TOUCH_MOVE:
-    if (abs(currentPoint.x - mGestureDownPoint.x) > sDragThreshold.width ||
-        abs(currentPoint.y - mGestureDownPoint.y) > sDragThreshold.height) {
+    if (std::abs(currentPoint.x - mGestureDownPoint.x) > sDragThreshold.width ||
+        std::abs(currentPoint.y - mGestureDownPoint.y) > sDragThreshold.height) {
       CancelTapTracking();
     }
     return;
 
   case NS_TOUCH_END:
     if (!nsIPresShell::gPreventMouseEvents) {
       DispatchSynthesizedMouseEvent(NS_MOUSE_MOVE, time, currentPoint, mWidget);
       DispatchSynthesizedMouseEvent(NS_MOUSE_BUTTON_DOWN, time, currentPoint, mWidget);

--- a/gfx/2d/Path.cpp
+++ b/gfx/2d/Path.cpp
@@ -247,17 +247,17 @@ FlattenBezierCurveSegment(const BezierCo
 
   Float t = 0;
   while (t < 1.0f) {
     Point cp21 = currentCP.mCP2 - currentCP.mCP3;
     Point cp31 = currentCP.mCP3 - currentCP.mCP1;
 
     Float s3 = (cp31.x * cp21.y - cp31.y * cp21.x) / hypotf(cp21.x, cp21.y);
 
-    t = 2 * Float(sqrt(aTolerance / (3. * abs(s3))));
+    t = 2 * Float(sqrt(aTolerance / (3. * std::abs(s3))));
 
     if (t >= 1.0f) {
       aSink->LineTo(aControlPoints.mCP4);
       break;
     }
 
     Point prevCP2, prevCP3, nextCP1, nextCP2, nextCP3;
     SplitBezier(currentCP, nullptr, &currentCP, t);
@@ -276,33 +276,33 @@ FindInflectionApproximationRange(BezierC
     Point cp21 = aControlPoints.mCP2 - aControlPoints.mCP1;
     Point cp41 = aControlPoints.mCP4 - aControlPoints.mCP1;
 
     if (cp21.x == 0.f && cp21.y == 0.f) {
       // In this case s3 becomes lim[n->0] (cp41.x * n) / n - (cp41.y * n) / n = cp41.x - cp41.y.
 
       // Use the absolute value so that Min and Max will correspond with the
       // minimum and maximum of the range.
-      *aMin = aT - CubicRoot(abs(aTolerance / (cp41.x - cp41.y)));
-      *aMax = aT + CubicRoot(abs(aTolerance / (cp41.x - cp41.y)));
+      *aMin = aT - CubicRoot(std::abs(aTolerance / (cp41.x - cp41.y)));
+      *aMax = aT + CubicRoot(std::abs(aTolerance / (cp41.x - cp41.y)));
       return;
     }
 
     Float s3 = (cp41.x * cp21.y - cp41.y * cp21.x) / hypotf(cp21.x, cp21.y);
 
     if (s3 == 0) {
       // This means within the precision we have it can be approximated
       // infinitely by a linear segment. Deal with this by specifying the
       // approximation range as extending beyond the entire curve.
       *aMin = -1.0f;
       *aMax = 2.0f;
       return;
     }
 
-    Float tf = CubicRoot(abs(aTolerance / s3));
+    Float tf = CubicRoot(std::abs(aTolerance / s3));
 
     *aMin = aT - tf * (1 - aT);
     *aMax = aT + tf * (1 - aT);
 }
 
 /* Find the inflection points of a bezier curve. Will return false if the
  * curve is degenerate in such a way that it is best approximated by a straight
  * line.

--- a/gfx/src/FilterSupport.cpp
+++ b/gfx/src/FilterSupport.cpp
@@ -1315,17 +1315,17 @@ ResultChangeRegionForPrimitive(const Fil
     case PrimitiveType::Offset:
     {
       IntPoint offset = atts.GetIntPoint(eOffsetOffset);
       return aInputChangeRegions[0].MovedBy(offset.x, offset.y);
     }
 
     case PrimitiveType::DisplacementMap:
     {
-      int32_t scale = ceil(abs(atts.GetFloat(eDisplacementMapScale)));
+      int32_t scale = ceil(std::abs(atts.GetFloat(eDisplacementMapScale)));
       return aInputChangeRegions[0].Inflated(nsIntMargin(scale, scale, scale, scale));
     }
 
     case PrimitiveType::GaussianBlur:
     {
       Size stdDeviation = atts.GetSize(eGaussianBlurStdDeviation);
       int32_t dx = InflateSizeForBlurStdDev(stdDeviation.width);
       int32_t dy = InflateSizeForBlurStdDev(stdDeviation.height);
@@ -1544,17 +1544,17 @@ SourceNeededRegionForPrimitive(const Fil
       return aResultNeededRegion.MovedBy(-nsIntPoint(offset.x, offset.y));
     }
 
     case PrimitiveType::DisplacementMap:
     {
       if (aInputIndex == 1) {
         return aResultNeededRegion;
       }
-      int32_t scale = ceil(abs(atts.GetFloat(eDisplacementMapScale)));
+      int32_t scale = ceil(std::abs(atts.GetFloat(eDisplacementMapScale)));
       return aResultNeededRegion.Inflated(nsIntMargin(scale, scale, scale, scale));
     }
 
     case PrimitiveType::GaussianBlur:
     {
       Size stdDeviation = atts.GetSize(eGaussianBlurStdDeviation);
       int32_t dx = InflateSizeForBlurStdDev(stdDeviation.width);
       int32_t dy = InflateSizeForBlurStdDev(stdDeviation.height);