Examine source code of Pomodoro Blacklist

{
  "manifest_version": 2,
  "name": "Pomodoro Blacklist",
  "version": "1.0.2",
  "description": "Minimalist, gently dystopian Pomodoro timer and site blocker",
  "browser_specific_settings": {
    "gecko": {
      "id": "{ce4318e0-1653-4d47-b05b-749958f04abc}",
      "strict_min_version": "79.0"
    }
  },
  "icons": {
    "48": "assets/icons/all-48.png",
    "96": "assets/icons/all-96.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "assets/icons/all-48.png",
      "96": "assets/icons/all-96.png"
    },
    "default_title": "Pomodoro Blacklist",
    "default_popup": "src/popup/pomodoro-blacklist.html"
  },
  "permissions": [
    "storage",
    "<all_urls>",
    "tabs"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "web_accessible_resources": [
    "src/blocked.html"
  ]
}