Examine source code of Stay Sharp

{
  "manifest_version": 2,
  "name": "Stay Sharp",
  "version": "1.0",
  "description": "Blocks distracting websites to help you stay sharp and focused.",
  "author": "Ravi Kumar Gupta",
  "homepage_url": "https://kravigupta.in",
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "blocker.html"
  ],
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "stay-sharp@kravigupta.in"
    }
  }
}