Examine source code of Qrcodify

{
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "name": "Qrcodify",
  "version": "1.0.7",
  "default_locale": "zh-cn",
  "homepage_url": "https://addons.mozilla.org/zh-CN/firefox/addon/qrcodify/?src=api",
  "icons": {
    "48": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "popup/qrious.js",
        "content_scripts/css.js",
        "content_scripts/beastify.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Qrcodify",
    "default_popup": "popup/qrcoder.html"
  }
}