Examine source code of CX Enable Vim

{
  "manifest_version": 2,
  "name": "CX Enable Vim",
  "version": "1.8",
  "description": "Enable vim mode in Code Expert",
  "icons": {
    "16": "icons/icon-16x16.png",
    "48": "icons/icon-48x48.png",
    "128": "icons/icon-128x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://expert.ethz.ch/*",
        "*://cxedu.ethz.ch/*"
      ],
      "js": [
        "js/ace-enable-vim.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "js/toggle.js"
    ]
  },
  "web_accessible_resources": [
    "js/ace-keybinding-vim.js",
    "js/set-vim-keyboard-handler.js",
    "js/set-default-keyboard-handler.js"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "3486b8b3-982a-482c-8dfb-77ad9c4550c3@example.com"
    }
  }
}