Examine source code of Filter Drop-Down Menu

{
  "name": "__MSG_extensionName__",
  "author": "Terry",
  "version": "0.1.3",
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "default_locale": "en",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icon_16.png",
      "24": "icon_24.png",
      "38": "icon_38.png",
      "48": "icon_48.png"
    },
    "default_title": "__MSG_browserActionTitle__",
    "default_popup": "popup.html",
    "browser_style": true
  }
}