Examine source code of Night Mode Eye Guard

{
  "name": "Night Mode Eye Guard",
  "version": "3.2.5resigned1",
  "description": "Night Mode Eye Guard, one click to use night theme to protect eyesight.",
  "background": {
    "page": "views/bg.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "js/plt.js",
        "js/nt.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "24": "imgs/icon24.png",
    "48": "imgs/icon48.png",
    "128": "imgs/icon128.png"
  },
  "permissions": [
    "storage",
    "idle",
    "tabs",
    "*://*/*"
  ],
  "manifest_version": 2,
  "web_accessible_resources": [
    "style/basic.css",
    "style/ext.css",
    "js/nt.js",
    "js/plt.js"
  ],
  "browser_action": {
    "default_icon": {
      "32": "imgs/icon32.png",
      "48": "imgs/icon48.png",
      "64": "imgs/icon64.png"
    },
    "default_title": "click to turn on/off night mode to protect eyesight",
    "default_popup": "views/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-4kGswXOBHEsvhQ@jetpack"
    }
  }
}