Examine source code of ひらくウェブ (Hiraku Web)

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "0.6.0",
  "icons": {
    "16": "icon/icon@16w.png",
    "32": "icon/icon@32w.png",
    "48": "icon/icon@48w.png",
    "128": "icon/icon@128w.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus"
  ],
  "options_ui": {
    "open_in_tab": true,
    "browser_style": false,
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hiraku-web@ymrl.net"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "__MSG_extensionName__",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}