Examine source code of S3 Bucket List

{
  "manifest_version": 2,
  "name": "S3 Bucket List",
  "version": "1.19",
  "description": "Finds Amazon S3 Buckets while browsing then records it in the add-on content.",
  "homepage_url": "https://github.com/AlecBlance/S3BucketList",
  "icons": {
    "512": "icons/bucket.png"
  },
  "permissions": [
    "webRequest",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/bucket.png",
    "default_title": "S3 Bucket List",
    "default_popup": "popup/index.html"
  }
}