Examine source code of Docs-Vim

{
  "manifest_version": 2,
  "name": "Docs-Vim",
  "version": "2.0.2",
  "applications": {
    "gecko": {
      "strict_min_version": "48.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*document/d/*/edit*"
      ],
      "js": [
        "jquery.min.js",
        "docs.js",
        "docs-vim.js"
      ]
    }
  ]
}