Examine source code of Norwegian Website Blocker

{
  "manifest_version": 2,
  "name": "Norwegian Distraction Website Blocker",
  "version": "1.0.6",
  "description": "This extension helps the user by blocking him or her from absent-minded use of websites that waste the user's time. This extension blocks sites that are common in Norway, including Facebook, VG, Dagbladet, Aftenposten, and NRK.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c68246ed-44e0-4693-84a1-9fd4f9475ee0}",
      "strict_min_version": "58.0",
      "categories": [
        "privacy-security"
      ]
    }
  },
  "license": "MIT"
}