Examine source code of Vim For Docs

{
  "manifest_version": 3,
  "name": "Vim-For-Docs",
  "description": "An implementation of Vim motions for Google Docs",
  "version": "2.7",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "greenstorm@vimfordocs.org"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_popup": "ui/index.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "content_scripts": [
    {
      "js": [
        "parser.js",
        "executor.js",
        "ui.js",
        "line-numbers.js",
        "content.js"
      ],
      "matches": [
        "https://docs.google.com/document/*",
        "https://docs.google.com/document/d/*",
        "https://docs.google.com/document/create*",
        "https://docs.google.com/document/u/*/create*",
        "https://docs.google.com/document/t/*",
        "https://docs.google.com/document/d/t/*"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "page_script.js",
        "browser-api.js",
        "motions.json"
      ],
      "matches": [
        "https://docs.google.com/*"
      ]
    }
  ]
}