Examine source code of Jumpcat

{
  "name": "Jumpcat",
  "version": "0.20.0",
  "description": "The missing command palette for GitHub",
  "homepage_url": "https://github.com/stefanbuck/jumpcat",
  "manifest_version": 2,
  "minimum_chrome_version": "74",
  "applications": {
    "gecko": {
      "id": "jumpcat@stefanbuck.com",
      "strict_min_version": "67.0"
    }
  },
  "omnibox": {
    "keyword": "j"
  },
  "icons": {
    "16": "/assets/icon-16.png",
    "48": "/assets/icon-48.png",
    "128": "/assets/icon-128.png"
  },
  "permissions": [
    "storage",
    "https://github.com/"
  ],
  "options_ui": {
    "chrome_style": true,
    "page": "/app/options/options.html"
  },
  "background": {
    "persistent": false,
    "scripts": [
      "/app/background/index.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "css": [
        "/assets/style.css"
      ],
      "js": [
        "/app/index.js"
      ]
    }
  ]
}