Examine source code of Bort

{
  "manifest_version": 2,
  "name": "Bort",
  "version": "2.1resigned1",
  "author": "Osmo Salomaa",
  "description": "Official extension for the Bort.io bookmark service",
  "icons": {
    "16": "bort-16.png",
    "32": "bort-32.png",
    "48": "bort-48.png",
    "128": "bort-128.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "bort-16.png",
      "32": "bort-32.png",
      "64": "bort-64.png"
    },
    "default_title": "Add Bort.io bookmark"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab"
  ],
  "offline_enabled": false,
  "browser_specific_settings": {
    "gecko": {
      "id": "@bort.io"
    }
  }
}