Examine source code of Pin Tab Toggle

{
  "manifest_version": 2,
  "name": "Pin Tab Toggle",
  "version": "1.0",
  "description": "Toggle pin/unpin for the current tab with one click.",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_title": "Pin/Unpin Tab"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{38bab0cc-e0ef-4c3b-9b21-7ef784496e9c}"
    }
  }
}