Examine source code of SCs Currency Converter

{
  "manifest_version": 2,
  "name": "SCs Currency Converter",
  "description": "Convert US Dollar, British Pound Sterling and Euro prices to a user set currency",
  "version": "1.2.2",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png"
  },
  "applications": {
    "gecko": {
      "id": "scscurrencyconverter@sarics",
      "strict_min_version": "60.0"
    }
  },
  "permissions": [
    "https://*/*",
    "storage",
    "notifications",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    },
    "default_title": "SCs Currency Converter",
    "default_popup": "popup/popup.html"
  },
  "options_ui": {
    "browser_style": true,
    "open_in_tab": true,
    "page": "options/options.html"
  }
}