Examine source code of TST Notepad

{
  "manifest_version": 2,
  "name": "TST Notepad",
  "version": "1.3",
  "description": "Adds a notepad to the Tree Style Tabs subpanel",
  "icons": {
    "48": "/notepad-48.png"
  },
  "options_ui": {
    "page": "/options/options.html"
  },
  "background": {
    "page": "/background/background.html"
  },
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "web_accessible_resources": [
    "resources/*",
    "panel/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tstnotepad@capinski.dev",
      "strict_min_version": "57.0"
    }
  }
}