Examine source code of Tab-less

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "0.7.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "en",
  "action": {
    "default_title": "__MSG_browserActionTitle__"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c8ded5a1-00d6-407b-ab93-eb0555f97db6}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}