Examine source code of Open in Popup

{
  "$schema": "http://json.schemastore.org/webextension",
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "192": "icons/icon-192.png",
      "384": "icons/icon-384.png",
      "768": "icons/icon-768.png",
      "1536": "icons/icon-1536.png"
    },
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4ae76e8a-0610-47c5-8ec4-1895518e82e9}",
      "strict_min_version": "77.0"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+O"
      },
      "description": "__MSG_extensionDescription__"
    }
  },
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "developer": {
    "name": "Soushi Atsumi",
    "url": "https://pharaoh-development.blogspot.jp/"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "192": "icons/icon-192.png",
    "384": "icons/icon-384.png",
    "768": "icons/icon-768.png",
    "1536": "icons/icon-1536.png"
  },
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "optional_permissions": [
    "*://*/*",
    "bookmarks"
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "version": "4.4"
}