1. firefox-external-messaging: runtime.sendMessage error Error: Could not establish connection. Receiving end does not exist.

Stack trace:
Async*sendMessage@resource://gre/modules/ExtensionContent.jsm -> moz-extension://9c7d175e-4040-4fd9-9609-2f2eef7a8eb3/include/compat-content-script.js:30:6
sendExtensionMessage@moz-extension://9c7d175e-4040-4fd9-9609-2f2eef7a8eb3/include/sweettooth-api.js:172:3
sendResolveExtensionMessage/<@moz-extension://9c7d175e-4040-4fd9-9609-2f2eef7a8eb3/include/sweettooth-api.js:149:4
sendResolveExtensionMessage@moz-extension://9c7d175e-4040-4fd9-9609-2f2eef7a8eb3/include/sweettooth-api.js:148:10
initialize@moz-extension://9c7d175e-4040-4fd9-9609-2f2eef7a8eb3/include/sweettooth-api.js:73:16
exports.load/<@https://extensions.gnome.org/static/js/dbus.074cd8004c0b.js:98:5
fire@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:1075:10
add@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:1110:7
ready@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:279:3
exports.load@https://extensions.gnome.org/static/js/dbus.074cd8004c0b.js:55:3
callPlugin/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1135:21
bind/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:119:20
on@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:496:21
callPlugin@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1052:17
fetch@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:920:21
check@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:959:21
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1174:17
callPlugin/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1082:29
bind/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:119:20
emit/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1187:21
each@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:56:21
emit@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1186:17
check@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1040:29
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1174:17
init@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:877:21
callGetModule@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1199:13
completeLoad@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1496:21
onScriptLoad@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1641:21
EventListener.handleEvent*req.load@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1820:17
load@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1609:17
load@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:937:21
fetch@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:927:21
check@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:959:21
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1174:17
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1463:21
callPlugin@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1140:17
fetch@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:920:21
check@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:959:21
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1174:17
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1463:21
enable/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1161:25
bind/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:119:20
each@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:56:21
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1154:17
init@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:877:21
callGetModule@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1199:13
completeLoad@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1496:21
onScriptLoad@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1641:21
EventListener.handleEvent*req.load@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1820:17
load@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1609:17
load@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:937:21
fetch@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:927:21
check@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:959:21
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1174:17
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1463:21
enable/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1161:25
bind/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:119:20
each@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:56:21
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1154:17
EventListener.handleEvent*req.load@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1820:17
load@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1609:17
load@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:937:21
fetch@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:927:21
check@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:959:21
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1174:17
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1463:21
enable/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1161:25
bind/<@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:119:20
each@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:56:21
enable@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1154:17
init@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:877:21
require@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1425:17
requirejs@https://extensions.gnome.org/static/js/require.84b7823d3c10.js:1704:16
@https://extensions.gnome.org/:28:13
fire@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:1075:10
fireWith@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:1193:7
ready@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:435:4
DOMContentLoaded@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:949:3
EventListener.handleEvent*bindReady@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:461:4
ready@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:276:3
init@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:198:11
jQuery@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:27:10
jQuery.support<@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:1537:2
@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:1360:19
@https://extensions.gnome.org/static/js/jquery.af693f9aea7d.js:16:2
  compat-content-script.js:38:8

2. Error: Load timeout for modules: dbus!__unnormalized2,dbus!__unnormalized3,dbus!_
http://requirejs.org/docs/errors.html#timeout  require.84b7823d3c10.js:175:17