--- a/dom/canvas/TexUnpackBlob.cpp
+++ b/dom/canvas/TexUnpackBlob.cpp
@@ -309,25 +309,26 @@ TexUnpackBlob::ConvertIfNeeded(WebGLCont
         return true;
 
     const auto& dstIsPremult = webgl->mPixelStore_PremultiplyAlpha;
     const auto srcOrigin = (webgl->mPixelStore_FlipY ? gl::OriginPos::TopLeft
                                                      : gl::OriginPos::BottomLeft);
     const auto dstOrigin = gl::OriginPos::BottomLeft;
 
     if (srcFormat != dstFormat) {
-        webgl->GenerateWarning("%s: Conversion requires pixel reformatting.", funcName);
+        webgl->GeneratePerfWarning("%s: Conversion requires pixel reformatting.",
+                                   funcName);
     } else if (mSrcIsPremult != dstIsPremult) {
-        webgl->GenerateWarning("%s: Conversion requires change in"
-                               "alpha-premultiplication.",
-                               funcName);
+        webgl->GeneratePerfWarning("%s: Conversion requires change in"
+                                   "alpha-premultiplication.",
+                                   funcName);
     } else if (srcOrigin != dstOrigin) {
-        webgl->GenerateWarning("%s: Conversion requires y-flip.", funcName);
+        webgl->GeneratePerfWarning("%s: Conversion requires y-flip.", funcName);
     } else if (srcStride != dstStride) {
-        webgl->GenerateWarning("%s: Conversion requires change in stride.", funcName);
+        webgl->GeneratePerfWarning("%s: Conversion requires change in stride.", funcName);
     } else {
         return true;
     }
 
     ////
 
     const auto dstTotalBytes = CheckedUint32(rowCount) * dstStride;
     if (!dstTotalBytes.isValid()) {
@@ -637,19 +638,19 @@ TexUnpackImage::TexOrSubImage(bool isSub
             break;
         }
 
         // Blitting was successful, so we're done!
         *out_error = 0;
         return true;
     } while (false);
 
-    webgl->GenerateWarning("%s: Failed to hit GPU-copy fast-path. Falling back to CPU"
-                           " upload.",
-                           funcName);
+    webgl->GeneratePerfWarning("%s: Failed to hit GPU-copy fast-path. Falling back to CPU"
+                               " upload.",
+                               funcName);
 
     const RefPtr<gfx::SourceSurface> surf = mImage->GetAsSourceSurface();
 
     RefPtr<gfx::DataSourceSurface> dataSurf;
     if (surf) {
         // WARNING: OSX can lose our MakeCurrent here.
         dataSurf = surf->GetDataSurface();
     }