Examine source code of Memory Saver

{
  "manifest_version": 2,
  "name": "Memory Saver",
  "version": "1.0",
  "description": "一定時間使っていないタブを自動で休止してメモリを節約します。",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{16d591a0-ebb8-4838-b7ae-a7d9395bc564}"
    }
  }
}