Examine source code of HTML Content Blocker

{
  "manifest_version": 2,
  "name": "HTML Content Blocker",
  "version": "1.0",
  "description": "Blocks the HTML content of the current web page.",
  "browser_action": {
    "default_icon": "icon.png"
  },
  "permissions": [
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{84f83dfc-8f61-4922-bc56-32db31239883}"
    }
  }
}