Examine source code of Gitako - Github file tree

{
  "manifest_version": 3,
  "name": "Gitako - GitHub file tree",
  "icons": {
    "64": "icons/Gitako-64.png",
    "128": "icons/Gitako-128.png",
    "256": "icons/Gitako-256.png"
  },
  "permissions": [
    "scripting",
    "storage",
    "contextMenus",
    "activeTab"
  ],
  "host_permissions": [
    "*://*.github.com/*",
    "*://gitako.enix.one/*",
    "*://*.sentry.io/*"
  ],
  "optional_host_permissions": [
    "*://*/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/vscode/*"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    },
    {
      "resources": [
        "content.css"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": "icons/Gitako.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "firefox-shim.js",
        "browser-polyfill.js",
        "content.js"
      ]
    }
  ],
  "version": "3.15.4",
  "description": "File tree for GitHub, and more than that.",
  "author": "EnixCoda",
  "homepage_url": "https://github.com/EnixCoda/Gitako",
  "browser_specific_settings": {
    "gecko": {
      "id": "{983bd86b-9d6f-4394-92b8-63d844c4ce4c}"
    }
  }
}