diff --git a/app/lib/AudioPlayer.coffee b/app/lib/AudioPlayer.coffee
index 773a72d35..9d7143192 100644
--- a/app/lib/AudioPlayer.coffee
+++ b/app/lib/AudioPlayer.coffee
@@ -111,9 +111,6 @@ class AudioPlayer extends CocoClass
       @soundsToPlayWhenLoaded[name] = audioOptions.volume
     audioOptions = @applyPanning audioOptions, pos if @camera and not @camera.destroyed and pos
     instance = createjs.Sound.play name, audioOptions
-    # For some reason, individual sound volume control doesn't work any more.
-    # I tried updating to SoundJS NEXT on 2014-09-10, but couldn't get any sounds to play with that one.
-    #console.log 'got instance with volume', instance.volume, instance._volume, instance.gainNode?.gain.value
     instance
 
   hasLoadedSound: (filename, name) ->
diff --git a/app/lib/surface/MusicPlayer.coffee b/app/lib/surface/MusicPlayer.coffee
index 383f7f79b..b218ea05b 100644
--- a/app/lib/surface/MusicPlayer.coffee
+++ b/app/lib/surface/MusicPlayer.coffee
@@ -27,7 +27,7 @@ module.exports = class MusicPlayer extends CocoClass
   onPlayMusic: (e) ->
     return if application.isIPadApp  # Hard to measure, but just guessing this will save memory.
     src = e.file
-    src = "/file#{e.file}#{AudioPlayer.ext}"
+    src = "/file#{src}#{AudioPlayer.ext}"
     if (not e.file) or src is @currentMusic?.src
       if e.play then @restartCurrentMusic() else @fadeOutCurrentMusic()
       return
diff --git a/app/models/User.coffee b/app/models/User.coffee
index 09157abd1..a3d6e3aeb 100644
--- a/app/models/User.coffee
+++ b/app/models/User.coffee
@@ -144,7 +144,7 @@ module.exports = class User extends CocoModel
     @subscribeCopyGroup = switch group
       when 0, 1, 2 then 'original'
       when 3, 4, 5 then 'new'
-    if /^en/.test(@get('preferredLanguage')) and not me.isAdmin()
+    if (not @get('preferredLanguage') or /^en/.test(@get('preferredLanguage'))) and not me.isAdmin()
       application.tracker.identify subscribeCopyGroup: @subscribeCopyGroup
     else
       @subscribeCopyGroup = 'original'
diff --git a/app/styles/play/world-map-view.sass b/app/styles/play/world-map-view.sass
index 64a8eec6b..d96b8dda6 100644
--- a/app/styles/play/world-map-view.sass
+++ b/app/styles/play/world-map-view.sass
@@ -96,6 +96,7 @@ $gameControlMargin: 30px
     .map-background
       width: 100%
       height: 100%
+      @include user-select(none)
 
     .level, .level-shadow
       position: absolute
diff --git a/app/views/core/CocoView.coffee b/app/views/core/CocoView.coffee
index 0273cb245..593c79e07 100644
--- a/app/views/core/CocoView.coffee
+++ b/app/views/core/CocoView.coffee
@@ -161,7 +161,7 @@ module.exports = class CocoView extends Backbone.View
       else
         @warnConnectionError()
         return _.delay (=> r.load()), 3000
-        
+
     @$el.find('.loading-container .errors').append(loadingErrorTemplate({
       status: r.jqxhr?.status
       name: r.name
@@ -173,7 +173,7 @@ module.exports = class CocoView extends Backbone.View
   warnConnectionError: ->
     msg = $.i18n.t 'loading_error.connection_failure', defaultValue: 'Connection failed.'
     noty text: msg, layout: 'center', type: 'error', killer: true, timeout: 3000
-    
+
   onRetryResource: (e) ->
     res = @supermodel.getResource($(e.target).data('resource-index'))
     # different views may respond to this call, and not all have the resource to reload
@@ -425,6 +425,9 @@ module.exports = class CocoView extends Backbone.View
   isIPadBrowser: ->
     navigator?.userAgent?.indexOf('iPad') isnt -1
 
+  isFirefox: ->
+    navigator.userAgent.toLowerCase().indexOf('firefox') isnt -1
+
   initSlider: ($el, startValue, changeCallback) ->
     slider = $el.slider({animate: 'fast'})
     slider.slider('value', startValue)