Examine source code of Khantent Blocker

{
  "manifest_version": 2,
  "short_name": "Khantent Blocker",
  "name": "Khantent Blocker",
  "description": "Set limits on social media and learn things instead!",
  "version": "0.0.0.1",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    },
    "default_popup": "extension.html"
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}