Examine source code of PrUn Palette

{
  "manifest_version": 2,
  "name": "PrUn Palette",
  "version": "0.6.2",
  "description": "Adds a command palette to Prosperous Universe",
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://apex.prosperousuniverse.com/*"
      ],
      "js": [
        "index.js"
      ],
      "css": [
        "index.css"
      ]
    }
  ],
  "permissions": [
    "*://rest.fnar.net/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "prun-palette@prun-palette",
      "strict_min_version": "60.0"
    }
  }
}