Examine source code of Wannabe RSS Reader

{
  "manifest_version": 2,
  "name": "Wannabe RSS Reader",
  "version": "1.6.2",
  "description": "Very simple sidebar RSS reader.",
  "icons": {
    "19": "icons/appicon-19.png",
    "32": "icons/appicon-32.png",
    "48": "icons/appicon-48.png",
    "64": "icons/appicon-64.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Find feeds in page",
    "default_popup": "inspect/inspect_popup.html",
    "default_icon": {
      "19": "icons/appicon-19.png",
      "32": "icons/appicon-32.png",
      "48": "icons/appicon-48.png",
      "64": "icons/appicon-64.png"
    }
  },
  "sidebar_action": {
    "default_title": "Wannabe RSS Reader",
    "default_panel": "sidebar/sidebar.html",
    "default_icon": {
      "19": "icons/appicon-19.png",
      "32": "icons/appicon-32.png",
      "48": "icons/appicon-48.png",
      "64": "icons/appicon-64.png"
    }
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "permissions": [
    "http://*/",
    "https://*/",
    "storage",
    "bookmarks",
    "activeTab"
  ],
  "applications": {
    "gecko": {
      "id": "wannabe.rss.reader@vaclavj.cz",
      "strict_min_version": "57.0"
    }
  }
}