Examine source code of rdmbkmrk

{
  "manifest_version": 2,
  "name": "rdmbkmrk",
  "version": "1.0",
  "description": "Opens a random bookmark.",
  "background": {
    "scripts": [
      "src/rdmbkmrk.js"
    ]
  },
  "browser_action": {
    "default_title": "Open a random bookmark",
    "default_icon": {
      "16": "icons/rdmbkmrk-16.png",
      "32": "icons/rdmbkmrk-32.png"
    }
  },
  "permissions": [
    "bookmarks"
  ]
}