Examine source code of Extension Manager

{
  "manifest_version": 2,
  "name": "__MSG_name__",
  "description": "__MSG_description__",
  "version": "2.5.5",
  "default_locale": "en",
  "page_action": {
    "default_icon": {
      "16": "icon/logo.png",
      "32": "icon/logo.png",
      "48": "icon/logo.png",
      "128": "icon/logo.png",
      "300": "icon/logo.png"
    },
    "default_title": "__MSG_name__",
    "default_popup": "popup.html",
    "show_matches": [
      "*://*/*"
    ]
  },
  "icons": {
    "16": "icon/logo.png",
    "32": "icon/logo.png",
    "48": "icon/logo.png",
    "128": "icon/logo.png",
    "300": "icon/logo.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>",
    "activeTab",
    "management",
    "storage",
    "unlimitedStorage",
    "*://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{15bea603-f341-47aa-a925-cb933434fe8e}"
    }
  }
}