Bug 846919 - Allow image.* to be shown in about:support. r=adw

--HG--
extra : rebase_source : 4d491b8b97456c336da330f33b115b0a4c021091

toolkit/content/Troubleshoot.jsm

@@ -45,7 +45,7 @@ const PREFS_WHITELIST = [
   "general.useragent.",
   "gfx.",
   "html5.",
-  "image.mem.",
+  "image.",
   "javascript.",
   "keyword.",
   "layers.",