Examine source code of Adaptive Theme Creator

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "2.1",
  "description": "__MSG_extensionDescription__",
  "permissions": [
    "theme",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "background": {
    "scripts": [
      "lib/chroma.min.js",
      "background/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/events.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options_ui/page.html"
  },
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "__MSG_extensionName__",
    "default_popup": "options_ui/page.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3aebb6e1-b5e5-440f-a5e7-1fe875078e3d}"
    }
  },
  "default_locale": "en"
}