Examine source code of Mark-It

{
  "name": "Mark-It",
  "description": "Simple Markdown Note Taker",
  "version": "1.2.3",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "notepad/notepad.html",
    "default_icon": "icons/icon-32.png"
  },
  "permissions": [
    "storage"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F"
      },
      "description": "Opens notepad"
    },
    "new_tab_switch_mode": {
      "suggested_key": {
        "default": "Ctrl+Space",
        "mac": "MacCtrl+Space"
      },
      "description": "Sends command to switch between view and edit on new tab page"
    }
  },
  "chrome_url_overrides": {
    "newtab": "newTab/newTab.html"
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  }
}