Examine source code of Web-Palette

{
  "manifest_version": 2,
  "name": "Web-Palette",
  "version": "1.0.0",
  "description": "A command palette to help you control web apps with your keyboard.",
  "homepage_url": "https://github.com/RangerMauve/web-palette",
  "icons": {},
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "pallet.js"
      ]
    }
  ]
}