Examine source code of Popcorn Chomper

{
  "manifest_version": 2,
  "name": "Popcorn Chomper",
  "version": "2.9",
  "description": "This extension block all the bad sites that are contributed by the community",
  "icons": {
    "48": "icons/favicon.png"
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "tabs"
  ],
  "background": {
    "scripts": [
      "popcorn_chomper.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{68096d55-5155-43e0-8811-01908142bd0b}"
    }
  }
}