Examine source code of mPageControl

{
  "manifest_version": 2,
  "name": "mPageControl",
  "version": "1.0.3resigned1",
  "description": "mPageControl is a Firefox Plugin which provides the possibility to add scripts on the fly to modify the body of websites.",
  "icons": {
    "48": "icons/default-48.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/default-48.png",
    "default_title": "mPageControl",
    "default_popup": "popup/popup.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e753c8b-73ae-4913-a22f-56989b71e1d5}"
    }
  }
}