Examine source code of Desmos Auto Save

{
  "name": "Desmos Auto Save",
  "version": "1.1",
  "description": "Automatically save your Desmos projects! Never lose your work again.",
  "manifest_version": 2,
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "src/popup.html",
    "default_icon": {
      "16": "/img/desmos_autosave16.png",
      "32": "/img/desmos_autosave32.png",
      "48": "/img/desmos_autosave48.png",
      "128": "/img/desmos_autosave128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.desmos.com/*"
      ],
      "js": [
        "src/autosaver.js"
      ]
    }
  ],
  "icons": {
    "16": "/img/desmos_autosave16.png",
    "32": "/img/desmos_autosave32.png",
    "48": "/img/desmos_autosave48.png",
    "128": "/img/desmos_autosave128.png"
  }
}