Examine source code of Tracker Blocker

{
  "manifest_version": 2,
  "name": "Tracker Blocker",
  "version": "1.0",
  "description": "Blocks hidden tracking scripts on web pages.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{29c83d33-7a50-41c7-872b-2fd45fb9945d}"
    }
  }
}