Examine source code of Literary Clock

{
  "manifest_version": 2,
  "name": "Literary Clock",
  "version": "1.3.2resigned1",
  "description": "Read time in quotations.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "https://www.data.jma.go.jp/mscweb/data/himawari/img/fd_/",
    "storage",
    "unlimitedStorage"
  ],
  "background": {
    "page": "src/background.html"
  },
  "chrome_url_overrides": {
    "newtab": "src/newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ab9a7382-e394-440a-ae66-6917a46d2312}"
    }
  }
}