Examine source code of TimeChi Blocker

{
  "manifest_version": 2,
  "name": "TimeChi Blocker",
  "description": "This extension blocks and unblocks websites based on TimeChi user settings and device events.",
  "version": "0.2.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "timechi-blocker-ff@timechi.com"
    }
  },
  "icons": {
    "48": "images/icon48.png",
    "96": "images/icon96.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "images/icon48-crop.png",
      "96": "images/icon96-crop.png",
      "128": "images/icon128-crop.png"
    },
    "default_title": "TimeChi Blocker",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "https://*/*"
  ]
}