Examine source code of Tracker Block Visualizer

{
  "manifest_version": 2,
  "name": "Tracker Block Visualizer",
  "version": "1.0",
  "description": "Visualize trackers blocked on each page.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{be2042b7-288e-45f1-b6cc-9a8a97b4f742}"
    }
  }
}