Examine source code of Browser Navigator

{
  "description": "A better way to navigate your browser history and bookmarks",
  "manifest_version": 2,
  "name": "Browser Navigator",
  "version": "0.1.2",
  "homepage_url": "https://felipe.lavin.blog",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "browsernavigator@bloom.lat"
    }
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Browser Navigator"
  },
  "commands": {
    "open-browser-navigator-tab": {
      "suggested_key": {
        "default": "Ctrl+Alt+H"
      }
    }
  },
  "permissions": [
    "history",
    "bookmarks",
    "search"
  ]
}