Examine source code of Site Blocker

{
  "manifest_version": 2,
  "name": "Site Blocker",
  "description": "A simple website blocker to direct you to a page when you open a blocked page.",
  "version": "1.3.1",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "dist/scripts/background.js"
    ]
  },
  "web_accessible_resources": [
    "src/pages/redirect/redirect.html"
  ],
  "browser_action": {
    "default_popup": "src/pages/popup/popup.html",
    "default_title": "Site Blocker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6158e079-dd4f-478a-839a-060965177589}"
    }
  }
}