Examine source code of bookmarker_me

{
  "manifest_version": 2,
  "name": "Save to bookmarker.me",
  "description": "Save your favorites websites to Bookmarker.me",
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "scripting",
    "storage",
    "webRequest"
  ],
  "background": {
    "scripts": [
      "worker.js"
    ]
  },
  "version": "1.0.2",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "browser_action": {
    "default_title": "Bookmark it",
    "default_icon": "/images/icon-16.png"
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2ef835ac-ea89-49b4-a91d-f3f81e64a51b}"
    }
  }
}