Examine source code of Smart Amazon Smile

{
  "manifest_version": 2,
  "name": "Smart Amazon Smile",
  "version": "1.1.2",
  "description": "Redirect Amazon.com, Amazon.co.uk, and Amazon.de to Amazon Smile when logged in.",
  "author": "Aaron Papp",
  "homepage_url": "https://github.com/Aaron-P/SmartAmazonSmile",
  "icons": {
    "24": "src/icons/icon.svg",
    "32": "src/icons/icon.svg",
    "48": "src/icons/icon.svg",
    "64": "src/icons/icon.svg",
    "96": "src/icons/icon.svg"
  },
  "permissions": [
    "*://www.amazon.co.uk/*",
    "*://www.amazon.com/*",
    "*://www.amazon.de/*",
    "cookies",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9e0e0b12-7910-49da-b44b-1a2f9110d61e}",
      "strict_min_version": "57.0"
    }
  }
}