diff --git a/gfx/thebes/GLContext.cpp b/gfx/thebes/GLContext.cpp
index 1ff2c29b8279..7d7e00955f8b 100644
--- a/gfx/thebes/GLContext.cpp
+++ b/gfx/thebes/GLContext.cpp
@@ -342,7 +342,11 @@ GLContext::InitExtensions()
     const GLubyte *extensions = fGetString(LOCAL_GL_EXTENSIONS);
     char *exts = strdup((char *)extensions);
 
-    printf_stderr("GL extensions: %s\n", exts);
+    static bool once = false;
+
+    if (!once) {
+        printf_stderr("GL extensions: %s\n", exts);
+    }
 
     char *s = exts;
     bool done = false;
@@ -356,7 +360,9 @@ GLContext::InitExtensions()
 
         for (int i = 0; sExtensionNames[i]; ++i) {
             if (strcmp(s, sExtensionNames[i]) == 0) {
-                printf_stderr("Found extension %s\n", s);
+                if (!once) {
+                    printf_stderr("Found extension %s\n", s);
+                }
                 mAvailableExtensions[i] = 1;
             }
         }
@@ -365,6 +371,8 @@ GLContext::InitExtensions()
     }
 
     free(exts);
+
+    once = true;
 }
 
 PRBool
@@ -679,9 +687,11 @@ GLContext::ResizeOffscreenFBO(const gfxIntSize& aSize)
     if (firstTime) {
         UpdateActualFormat();
 
+#ifdef DEBUG
         printf_stderr("Created offscreen FBO: r: %d g: %d b: %d a: %d depth: %d stencil: %d\n",
                       mActualFormat.red, mActualFormat.green, mActualFormat.blue, mActualFormat.alpha,
                       mActualFormat.depth, mActualFormat.stencil);
+#endif
     }
 
     // We're good, and the framebuffer is already attached, so let's
@@ -1008,6 +1018,10 @@ RemoveNamesFromArray(GLContext *aOrigin, GLsizei aCount, GLuint *aNames, nsTArra
 {
     for (GLsizei j = 0; j < aCount; ++j) {
         GLuint name = aNames[j];
+        // name 0 can be ignored
+        if (name == 0)
+            continue;
+
         PRBool found = PR_FALSE;
         for (PRUint32 i = 0; i < aArray.Length(); ++i) {
             if (aArray[i].name == name) {
@@ -1016,8 +1030,11 @@ RemoveNamesFromArray(GLContext *aOrigin, GLsizei aCount, GLuint *aNames, nsTArra
                 break;
             }
         }
-        if (!found)
-            printf_stderr("GL Context %p deleting resource %d, which doesn't exist!", aOrigin, name);
+#ifdef DEBUG
+        if (!found) {
+            printf_stderr("GL Context %p deleting resource %d, which doesn't exist!\n", aOrigin, name);
+        }
+#endif
     }
 }