--- a/content/canvas/src/WebGLContext.cpp
+++ b/content/canvas/src/WebGLContext.cpp
@@ -1306,31 +1306,33 @@ WebGLContext::UpdateContextLossStatus()
         mEmitContextLostErrorOnce = true;
         return;
     }
 }
 
 void
 WebGLContext::ForceLoseContext()
 {
+    printf_stderr("WebGL(%p)::ForceLoseContext\n", this);
     MOZ_ASSERT(!IsContextLost());
     mContextStatus = ContextLostAwaitingEvent;
     mContextLostErrorSet = false;
     mLastLossWasSimulated = false;
 
     // Burn it all!
     DestroyResourcesAndContext();
 
     // Queue up a task, since we know the status changed.
     EnqueueUpdateContextLossStatus();
 }
 
 void
 WebGLContext::ForceRestoreContext()
 {
+    printf_stderr("WebGL(%p)::ForceRestoreContext\n", this);
     mContextStatus = ContextLostAwaitingRestore;
     mAllowContextRestore = true; // Hey, you did say 'force'.
 
     // Queue up a task, since we know the status changed.
     EnqueueUpdateContextLossStatus();
 }
 
 void