Examine source code of BookmarkTitler

{
  "manifest_version": 2,
  "name": "BookmarkTitler",
  "version": "1.1",
  "description": "Sets bookmark tab titles to the name of the bookmarks",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "permissions": [
    "*://*/*",
    "bookmarks",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{225d6e43-640a-4630-801f-cf12a6e8501b}"
    }
  }
}