diff -r 000000000000 -r 6474c204b198 addon-sdk/source/lib/sdk/console/plain-text.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/lib/sdk/console/plain-text.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,77 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { Cc, Ci, Cu, Cr } = require("chrome");
+const self = require("../self");
+const prefs = require("../preferences/service");
+const { merge } = require("../util/object");
+const { ConsoleAPI } = Cu.import("resource://gre/modules/devtools/Console.jsm", {});
+
+const DEFAULT_LOG_LEVEL = "error";
+const ADDON_LOG_LEVEL_PREF = "extensions." + self.id + ".sdk.console.logLevel";
+const SDK_LOG_LEVEL_PREF = "extensions.sdk.console.logLevel";
+
+let logLevel = DEFAULT_LOG_LEVEL;
+function setLogLevel() {
+  logLevel = prefs.get(ADDON_LOG_LEVEL_PREF,
+                           prefs.get(SDK_LOG_LEVEL_PREF,
+                                     DEFAULT_LOG_LEVEL));
+}
+setLogLevel();
+
+let logLevelObserver = {
+  QueryInterface: function(iid) {
+    if (!iid.equals(Ci.nsIObserver) &&
+        !iid.equals(Ci.nsISupportsWeakReference) &&
+        !iid.equals(Ci.nsISupports))
+      throw Cr.NS_ERROR_NO_INTERFACE;
+    return this;
+  },
+  observe: function(subject, topic, data) {
+    setLogLevel();
+  }
+};
+let branch = Cc["@mozilla.org/preferences-service;1"].
+             getService(Ci.nsIPrefService).
+             getBranch(null);
+branch.addObserver(ADDON_LOG_LEVEL_PREF, logLevelObserver, true);
+branch.addObserver(SDK_LOG_LEVEL_PREF, logLevelObserver, true);
+
+function PlainTextConsole(print, innerID) {
+
+  let consoleOptions = {
+    prefix: self.name + ": ",
+    maxLogLevel: logLevel,
+    dump: print,
+    innerID: innerID
+  };
+  let console = new ConsoleAPI(consoleOptions);
+
+  // As we freeze the console object, we can't modify this property afterward
+  Object.defineProperty(console, "maxLogLevel", {
+    get: function() {
+      return logLevel;
+    }
+  });
+
+  // We defined the `__exposedProps__` in our console chrome object.
+  //
+  // Meanwhile we're investigating with the platform team if `__exposedProps__`
+  // are needed, or are just a left-over.
+
+  console.__exposedProps__ = Object.keys(ConsoleAPI.prototype).reduce(function(exposed, prop) {
+    exposed[prop] = "r";
+    return exposed;
+  }, {});
+
+  Object.freeze(console);
+  return console;
+};
+exports.PlainTextConsole = PlainTextConsole;