diff --git a/omega-i18n/en/messages.json b/omega-i18n/en/messages.json
index c7a321e..aecae57 100644
--- a/omega-i18n/en/messages.json
+++ b/omega-i18n/en/messages.json
@@ -667,6 +667,21 @@
   "popup_errorLog": {
     "message": "Error log"
   },
+  "browserAction_profileDetails_PacProfile": {
+    "message": "(PAC script)"
+  },
+  "browserAction_profileDetails_SystemProfile": {
+    "message": "(controlled by other extensions or environment)"
+  },
+  "browserAction_profileDetails_DirectProfile": {
+    "message": "(not using any proxy)"
+  },
+  "browserAction_profileDetails_SwitchProfile": {
+    "message": "(switching based on conditions)"
+  },
+  "browserAction_profileDetails_RuleListProfile": {
+    "message": "(switching based on rule list)"
+  },
   "browserAction_titleNormal": {
     "message": "SwitchyOmega:: $PROFILE$",
     "placeholders": {
diff --git a/omega-i18n/zh_CN/messages.json b/omega-i18n/zh_CN/messages.json
index 6f8cb17..9095fc8 100644
--- a/omega-i18n/zh_CN/messages.json
+++ b/omega-i18n/zh_CN/messages.json
@@ -492,6 +492,9 @@
       }
     }
   },
+  "options_replaceProfileSuccess": {
+    "message": "更改选项成功。"
+  },
   "options_modalHeader_deleteProfile": {
     "message": "删除情景模式"
   },
@@ -664,6 +667,21 @@
   "popup_errorLog": {
     "message": "错误日志"
   },
+  "browserAction_profileDetails_PacProfile": {
+    "message": "(PAC 脚本)"
+  },
+  "browserAction_profileDetails_SystemProfile": {
+    "message": "(由其他扩展或系统环境控制)"
+  },
+  "browserAction_profileDetails_DirectProfile": {
+    "message": "(不使用任何代理)"
+  },
+  "browserAction_profileDetails_SwitchProfile": {
+    "message": "(根据条件切换)"
+  },
+  "browserAction_profileDetails_RuleListProfile": {
+    "message": "(根据规则列表切换)"
+  },
   "browserAction_titleNormal": {
     "message": "SwitchyOmega:: $PROFILE$",
     "placeholders": {
diff --git a/omega-i18n/zh_HK/messages.json b/omega-i18n/zh_HK/messages.json
index 0c8c8fb..99cf49d 100644
--- a/omega-i18n/zh_HK/messages.json
+++ b/omega-i18n/zh_HK/messages.json
@@ -492,6 +492,9 @@
       }
     }
   },
+  "options_replaceProfileSuccess": {
+    "message": "更改選項成功。"
+  },
   "options_modalHeader_deleteProfile": {
     "message": "刪除情景模式"
   },
@@ -664,6 +667,21 @@
   "popup_errorLog": {
     "message": "錯誤日誌"
   },
+  "browserAction_profileDetails_PacProfile": {
+    "message": "(PAC 指令碼)"
+  },
+  "browserAction_profileDetails_SystemProfile": {
+    "message": "(由其他擴展或系統環境控制)"
+  },
+  "browserAction_profileDetails_DirectProfile": {
+    "message": "(不使用任何代理)"
+  },
+  "browserAction_profileDetails_SwitchProfile": {
+    "message": "(根據條件切換)"
+  },
+  "browserAction_profileDetails_RuleListProfile": {
+    "message": "(根據規則列表切換)"
+  },
   "browserAction_titleNormal": {
     "message": "SwitchyOmega:: $PROFILE$",
     "placeholders": {
diff --git a/omega-i18n/zh_TW/messages.json b/omega-i18n/zh_TW/messages.json
index 6bf4c27..a111a66 100644
--- a/omega-i18n/zh_TW/messages.json
+++ b/omega-i18n/zh_TW/messages.json
@@ -492,6 +492,9 @@
       }
     }
   },
+  "options_replaceProfileSuccess": {
+    "message": "更改選項成功。"
+  },
   "options_modalHeader_deleteProfile": {
     "message": "刪除情景模式"
   },
@@ -664,6 +667,21 @@
   "popup_errorLog": {
     "message": "錯誤日誌"
   },
+  "browserAction_profileDetails_PacProfile": {
+    "message": "(PAC 指令碼)"
+  },
+  "browserAction_profileDetails_SystemProfile": {
+    "message": "(由其他擴展或系統環境控制)"
+  },
+  "browserAction_profileDetails_DirectProfile": {
+    "message": "(不使用任何代理)"
+  },
+  "browserAction_profileDetails_SwitchProfile": {
+    "message": "(根據條件切換)"
+  },
+  "browserAction_profileDetails_RuleListProfile": {
+    "message": "(根據規則列表切換)"
+  },
   "browserAction_titleNormal": {
     "message": "SwitchyOmega:: $PROFILE$",
     "placeholders": {
diff --git a/omega-pac/src/profiles.coffee b/omega-pac/src/profiles.coffee
index d2c2804..ae4dc21 100644
--- a/omega-pac/src/profiles.coffee
+++ b/omega-pac/src/profiles.coffee
@@ -139,7 +139,9 @@ module.exports = exports =
     handler = exports._handler(profile)
     cache.directReferenceSet = handler.directReferenceSet.call(exports, profile)
   allReferenceSet: (profile, options, opt_out) ->
+    o_profile = profile
     profile = exports.byName(profile, options)
+    throw new Error("Profile #{o_profile} does not exist!") if not profile?
     result = opt_out ? {}
     result[exports.nameAsKey(profile.name)] = profile.name
     for key, name of exports.directReferenceSet(profile)
diff --git a/omega-target-chromium-extension/background.coffee b/omega-target-chromium-extension/background.coffee
index 360cc6e..ef40313 100644
--- a/omega-target-chromium-extension/background.coffee
+++ b/omega-target-chromium-extension/background.coffee
@@ -127,10 +127,9 @@ options.setProxyNotControllable(null)
 timeout = null
 
 options.watchProxyChange (details) ->
-  lastProxyChangeAt = Date.now()
+  notControllableBefore = options.proxyNotControllable()
+  internal = false
   switch details['levelOfControl']
-    when "controllable_by_this_extension"
-      break
     when "controlled_by_other_extensions", "not_controllable"
       reason =
         if details['levelOfControl'] == 'not_controllable'
@@ -141,7 +140,9 @@ options.watchProxyChange (details) ->
     else
       options.setProxyNotControllable(null)
 
-  return if details['levelOfControl'] == 'controlled_by_this_extension'
+  if details['levelOfControl'] == 'controlled_by_this_extension'
+    internal = true
+    return if not notControllableBefore
   Log.log('external proxy: ', details)
 
   # Chromium will send chrome.proxy.settings.onChange on extension unload,
@@ -151,16 +152,16 @@ options.watchProxyChange (details) ->
   # To workaround this issue, wait for some time before setting the proxy.
   # However this will cause some delay before the settings are processed.
   clearTimeout(timeout) if timeout?
+  parsed = null
   timeout = setTimeout (->
-    options.setExternalProfile(
-      options.parseExternalProfile(details),
-      noRevert: true)
+    options.setExternalProfile(parsed, {noRevert: true, internal: internal})
   ), 500
+
+  parsed = options.parseExternalProfile(details)
   return
 
 external = false
 options.currentProfileChanged = (reason) ->
-  profile = options.currentProfile()
   iconCache = {}
 
   if reason == 'external'
@@ -176,19 +177,21 @@ options.currentProfileChanged = (reason) ->
       realCurrentName = current.defaultProfileName
       currentName += " [#{dispName(realCurrentName)}]"
       current = options.profile(realCurrentName)
-  title =
-    if profile.name == ''
-      details = profile.pacUrl ? options.printFixedProfile(profile)
-      details = details ? profile.profileType
-    else
-      chrome.i18n.getMessage('browserAction_titleNormal', [currentName])
-  if external and profile.profileType != 'SystemProfile'
+
+  details = options.printProfile(current)
+  if currentName
+    title = chrome.i18n.getMessage('browserAction_titleWithResult', [
+      currentName, '', details])
+  else
+    title = details
+
+  if external and current.profileType != 'SystemProfile'
     message = chrome.i18n.getMessage('browserAction_titleExternalProxy')
     title = message + '\n' + title
     options.setBadge()
 
   tabs.resetAll(
-    icon: drawIcon(profile.color)
+    icon: drawIcon(current.color)
     title: title
   )
 
diff --git a/omega-target-chromium-extension/src/options.coffee b/omega-target-chromium-extension/src/options.coffee
index 4aa592a..aa7d435 100644
--- a/omega-target-chromium-extension/src/options.coffee
+++ b/omega-target-chromium-extension/src/options.coffee
@@ -35,7 +35,7 @@ class ChromeOptions extends OmegaTarget.Options
       return results
 
   _proxyNotControllable: null
-  proxyNotControllable: => @_proxyNotControllable
+  proxyNotControllable: -> @_proxyNotControllable
   setProxyNotControllable: (reason) ->
     @_proxyNotControllable = reason
     if reason
@@ -110,7 +110,8 @@ class ChromeOptions extends OmegaTarget.Options
           watcher(details)
       chrome.proxy.settings.onChange.addListener @_proxyChangeListener
     @_proxyChangeWatchers.push(callback)
-  applyProfileProxy: (profile) ->
+  applyProfileProxy: (profile, meta) ->
+    meta ?= profile
     if profile.profileType == 'SystemProfile'
       # Clear proxy settings, returning proxy control to Chromium.
       return proxySettings.clearAsync({}).then =>
@@ -135,10 +136,10 @@ class ChromeOptions extends OmegaTarget.Options
         data: null
         mandatory: true
       setPacScript = @pacForProfile(profile).then (script) ->
-        profileName = OmegaPac.PacGenerator.ascii(JSON.stringify(profile.name))
+        profileName = OmegaPac.PacGenerator.ascii(JSON.stringify(meta.name))
         profileName = profileName.replace(/\*/g, '\\u002a')
         profileName = profileName.replace(/\\/g, '\\u002f')
-        prefix = "/*OmegaProfile*#{profileName}*#{profile.revision}*/"
+        prefix = "/*OmegaProfile*#{profileName}*#{meta.revision}*/"
         config['pacScript'].data = prefix + script
         return
     setPacScript ?= Promise.resolve()
@@ -193,8 +194,22 @@ class ChromeOptions extends OmegaTarget.Options
         result += "#{scheme.scheme}: #{pacResult}\n"
       else
         result += "#{pacResult}\n"
+    result ||= chrome.i18n.getMessage(
+      'browserAction_profileDetails_DirectProfile')
     return result
 
+  printProfile: (profile) ->
+    type = profile.profileType
+    if type.indexOf('RuleListProfile') >= 0
+      type = 'RuleListProfile'
+
+    if type == 'FixedProfile'
+      @printFixedProfile(profile)
+    else if type == 'PacProfile' and profile.pacUrl
+      profile.pacUrl
+    else
+      chrome.i18n.getMessage('browserAction_profileDetails_' + type) || null
+
   upgrade: (options, changes) ->
     super(options).catch (err) =>
       if not options?['schemaVersion']
diff --git a/omega-target-chromium-extension/src/parse_external_profile.coffee b/omega-target-chromium-extension/src/parse_external_profile.coffee
index a2b181f..a82cae4 100644
--- a/omega-target-chromium-extension/src/parse_external_profile.coffee
+++ b/omega-target-chromium-extension/src/parse_external_profile.coffee
@@ -63,7 +63,7 @@ module.exports = (details, options, fixedProfileConfig) ->
         proxies = {}
         for prop in props
           result = OmegaPac.Profiles.pacResult(details.value.rules[prop])
-          if prop == 'singleProxy'
+          if prop == 'singleProxy' and details.value.rules[prop]?
             proxies['fallbackProxy'] = result
           else
             proxies[prop] = result
diff --git a/omega-target/src/options.coffee b/omega-target/src/options.coffee
index b083f97..4ae924e 100644
--- a/omega-target/src/options.coffee
+++ b/omega-target/src/options.coffee
@@ -86,6 +86,14 @@ class Options
 
   toString: -> "<Options>"
 
+  ###*
+  # Return a localized, human-readable description of the given profile.
+  # In base class, this method is not implemented and will always return null.
+  # @param {?{}} profile The profile to print
+  # @returns {string} Description of the profile with details
+  ###
+  printProfile: (profile) -> null
+
   ###*
   # Upgrade options from previous versions.
   # For now, this method only supports schemaVersion 1 and 2. If so, it upgrades
@@ -268,7 +276,7 @@ class Options
   # Get PAC script for profile.
   # @param {?string|Object} profile The name of the profile, or the profile.
   # @param {bool=false} compress Compress the script if true.
-  # @returns {String} The compiled
+  # @returns {string} The compiled
   ###
   pacForProfile: (profile, compress = false) ->
     ast = OmegaPac.PacGenerator.script(@_options, profile)
@@ -288,11 +296,16 @@ class Options
         name: p.name
         profileType: p.profileType
         color: p.color
+        desc: @printProfile(p)
         builtin: if p.builtin then true
       if p.profileType == 'VirtualProfile'
         profiles[key].defaultProfileName = p.defaultProfileName
         if not allReferenceSet?
-          allReferenceSet = OmegaPac.Profiles.allReferenceSet profile, @_options
+          allReferenceSet =
+            if profile
+              OmegaPac.Profiles.allReferenceSet profile, @_options
+            else
+              {}
         if allReferenceSet[key]
           profiles[key].validResultProfiles =
             OmegaPac.Profiles.validResultProfilesFor(p, @_options)
@@ -357,7 +370,7 @@ class Options
 
       @_watchingProfiles = OmegaPac.Profiles.allReferenceSet(@_tempProfile,
         @_options)
-      @applyProfileProxy(@_tempProfile)
+      @applyProfileProxy(@_tempProfile, profile)
     else
       @applyProfileProxy(profile)
 
@@ -381,9 +394,10 @@ class Options
   # Set proxy settings based on the given profile.
   # In base class, this method is not implemented and will always reject.
   # @param {{}} profile The profile to apply
+  # @param {{}=profile} meta The metadata of the profile, like name and revision
   # @returns {Promise} A promise which is fulfilled when the proxy is set.
   ###
-  applyProfileProxy: (profile) ->
+  applyProfileProxy: (profile, meta) ->
     Promise.reject new Error('not implemented')
 
   ###*
@@ -707,6 +721,8 @@ class Options
   # @param {{}} profile The external profile
   # @param {?{}} args Extra arguments
   # @param {boolean=false} args.noRevert If true, do not revert changes.
+  # @param {boolean=false} args.internal If true, treat the profile change as
+  # caused by the options itself instead of external reasons.
   # @returns {Promise} A promise which is fulfilled when the profile is set
   ###
   setExternalProfile: (profile, args) ->
@@ -717,8 +733,11 @@ class Options
           return
     p = OmegaPac.Profiles.byName(profile.name, @_options)
     if p
-      @applyProfile(p.name,
-        {proxy: false, system: @_isSystem, reason: 'external'})
+      if args?.internal
+        @applyProfile(p.name, {proxy: false})
+      else
+        @applyProfile(p.name,
+          {proxy: false, system: @_isSystem, reason: 'external'})
     else
       @_currentProfileName = null
       @_externalProfile = profile
diff --git a/omega-web/src/coffee/omega_decoration.coffee b/omega-web/src/coffee/omega_decoration.coffee
index 32b0232..1e45710 100644
--- a/omega-web/src/coffee/omega_decoration.coffee
+++ b/omega-web/src/coffee/omega_decoration.coffee
@@ -98,7 +98,7 @@ angular.module('omegaDecoration', []).value('profileIcons', {
           scope.profileIcon = profileIcons[profile.profileType]
           break
     scope.$watch(scope.profiles, ((profiles) ->
-      scope.currentProfiles = profiles
+      scope.currentProfiles = profiles || []
       if scope.dispProfiles?
         scope.dispProfiles = currentProfiles
       updateView()
diff --git a/omega-web/src/coffee/popup.coffee b/omega-web/src/coffee/popup.coffee
index c9c953d..79847f0 100644
--- a/omega-web/src/coffee/popup.coffee
+++ b/omega-web/src/coffee/popup.coffee
@@ -9,7 +9,7 @@ module.filter 'dispName', (omegaTarget) ->
     omegaTarget.getMessage('profile_' + name) || name
 
 module.controller 'PopupCtrl', ($scope, $window, $q, omegaTarget,
-  profileIcons, profileOrder, dispNameFilter) ->
+  profileIcons, profileOrder, dispNameFilter, getVirtualTarget) ->
 
   refreshOnProfileChange = false
   refresh = ->
@@ -33,6 +33,12 @@ module.controller 'PopupCtrl', ($scope, $window, $q, omegaTarget,
       'glyphicon-ok'
     else
       undefined
+  $scope.getProfileTitle = (profile, normal) ->
+    desc = ''
+    while profile
+      desc = profile.desc
+      profile = getVirtualTarget(profile, $scope.availableProfiles)
+    desc || profile?.name || ''
   $scope.openOptions = (hash) ->
     omegaTarget.openOptions(hash).then ->
       $window.close()
diff --git a/omega-web/src/popup.jade b/omega-web/src/popup.jade
index 165fb3e..69f8800 100644
--- a/omega-web/src/popup.jade
+++ b/omega-web/src/popup.jade
@@ -26,10 +26,10 @@ html(lang='en' ng-app='omegaPopup' ng-controller='PopupCtrl' ng-csp)
   body(ng-class='{"with-condition-form": showConditionForm}')
     ul.nav.nav-pills.nav-stacked(ng-hide='showConditionForm || proxyNotControllable')
       li.profile(ng-repeat='profile in builtinProfiles' ng-class='{active: isActive(profile.name), "bg-info": isEffective(profile.name)}')
-        a(ng-click='applyProfile(profile)')
+        a(ng-click='applyProfile(profile)' title='{{getProfileTitle(profile)}}')
           span(omega-profile-inline='profile' icon='getIcon(profile)' options='availableProfiles' disp-name='dispNameFilter')
       li.profile.external-profile(ng-show='!!externalProfile' ng-class='{active: isActive(""), "bg-info": isEffective("")}')
-        a(ng-click='nameExternal.open = true')
+        a(ng-click='nameExternal.open = true' title='{{getProfileTitle(externalProfile)}}')
           form(name='nameExternalForm' ng-submit='nameExternalForm.$valid && saveExternal()')
             span(omega-profile-icon='externalProfile' icon='getIcon(externalProfile, "normal")' options='availableProfiles' disp-name='dispNameFilter')
             = ' '
@@ -39,9 +39,9 @@ html(lang='en' ng-app='omegaPopup' ng-controller='PopupCtrl' ng-csp)
       li.divider
       li.profile(ng-repeat='profile in customProfiles' ng-class='{active: isActive(profile.name), "bg-info": isEffective(profile.name)}'
         dropdown)
-        a(ng-click='applyProfile(profile)' ng-if='!profile.validResultProfiles')
+        a(ng-click='applyProfile(profile)' ng-if='!profile.validResultProfiles' title='{{getProfileTitle(profile)}}')
           span(omega-profile-inline='profile' icon='getIcon(profile)' options='availableProfiles' disp-name='dispNameFilter')
-        a.profile-with-default-edit(ng-click='applyProfile(profile)' ng-if='!!profile.validResultProfiles')
+        a.profile-with-default-edit(ng-click='applyProfile(profile)' ng-if='!!profile.validResultProfiles' title='{{getProfileTitle(profile)}}')
           span(omega-profile-inline='profile' icon='getIcon(profile)' options='availableProfiles' disp-name='dispNameFilter')
           = ' '
           | [{{profile.defaultProfileName}}]
@@ -49,7 +49,7 @@ html(lang='en' ng-app='omegaPopup' ng-controller='PopupCtrl' ng-csp)
             span.glyphicon.glyphicon-chevron-down
         ul.dropdown-menu(ng-if='!!profile.validResultProfiles')
           li(ng-repeat='p in profile.validResultProfiles' ng-class='{active: p.name == profile.defaultProfileName}')
-            a(ng-click='setDefaultProfile(profile.name, p.name)')
+            a(ng-click='setDefaultProfile(profile.name, p.name)' title='{{getProfileTitle(profile)}}')
               span(omega-profile-inline='p' options='availableProfiles' disp-name='dispNameFilter')
       li.divider(ng-show='!!currentDomain && validResultProfiles.length')
       li(ng-show='!!currentProfileCanAddRule')
@@ -66,7 +66,7 @@ html(lang='en' ng-app='omegaPopup' ng-controller='PopupCtrl' ng-csp)
         ul.dropdown-menu
           li(ng-repeat='profile in validResultProfiles' ng-class='{active: profile.name == currentTempRuleProfile}'
             ng-show='!!currentTempRuleProfile || validResultProfiles.length == 1 || profile.name != currentProfileName')
-            a(ng-click='addTempRule(currentDomain, profile.name)')
+            a(ng-click='addTempRule(currentDomain, profile.name)' title='{{getProfileTitle(profile)}}')
               span(omega-profile-inline='profile' options='availableProfiles' disp-name='dispNameFilter')
       li.divider
       li