Bug 987616 - Disable browser_image.js on debug builds due to frequent failures.

image/test/browser/browser.ini

@@ -10,4 +10,4 @@ support-files =
 [browser_bug666317.js]
 skip-if = e10s # Bug 948194 - Decoded Images seem to not be discarded on memory-pressure notification with e10s enabled
 [browser_image.js]
-skip-if = e10s || !debug # Test is only to run on debug builds
+skip-if = true # Bug 987616