Examine source code of bookmarks-tooltip

{
  "manifest_version": 2,
  "name": "bookmarks managers",
  "version": "1.5",
  "description": "manage your toolbar bookmarks",
  "icons": {
    "48": "icons/bookmark.png"
  },
  "permissions": [
    "bookmarks"
  ],
  "commands": {
    "shortcut": {
      "suggested_key": {
        "default": "Ctrl+Alt+Space"
      },
      "description": "quick invoke plugin"
    }
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/bookmark.png"
    },
    "default_title": "show bookmarks toolbar   (Ctrl+Alt+Space)",
    "default_popup": "popup/content.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{caf8047f-31c0-4495-8f99-73742b7c1499}"
    }
  }
}