Examine source code of Blue Light Filter New

{
  "manifest_version": 2,
  "name": "Blue Light Filter",
  "version": "1.0",
  "description": "Adds a blue light filter to the browser for comfortable night-time browsing.",
  "permissions": [
    "tabs",
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Blue Light Filter"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{27a1043d-d8d8-464a-a24c-0e7b451eaa83}"
    }
  }
}