Examine source code of PuzzleBlocker

{
  "name": "PuzzleBlocker: Stop wasting time with puzzles",
  "version": "1.1.5",
  "description": "Solve puzzles to stop procrastinating on time-wasting websites.",
  "homepage_url": "https://www.puzzleblocker.com",
  "manifest_version": 2,
  "minimum_chrome_version": "74",
  "applications": {
    "gecko": {
      "id": "me@nkretschmer.com",
      "strict_min_version": "67.0"
    }
  },
  "icons": {
    "128": "/icon_128.png"
  },
  "browser_action": {
    "default_icon": "/icon_128.png",
    "default_popup": "/popup/popup.html"
  },
  "permissions": [
    "storage",
    "alarms",
    "webNavigation"
  ],
  "options_ui": {
    "chrome_style": true,
    "browser_style": true,
    "page": "/options/options.html"
  },
  "background": {
    "persistent": false,
    "scripts": [
      "/background.js"
    ]
  }
}