Examine source code of Bobbin

{
  "name": "Bobbin",
  "description": "Bobbin lets you gather and share resources so you always have exactly what is needed for the task at hand.",
  "version": "2.2.1",
  "manifest_version": 3,
  "icons": {
    "16": "bobbin-icon.png",
    "32": "bobbin-icon.png",
    "48": "bobbin-icon.png",
    "128": "bobbin-icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Bobbin",
    "default_popup": "index.html",
    "default_icon": {
      "16": "bobbin-icon.png",
      "24": "bobbin-icon.png",
      "32": "bobbin-icon.png"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "cookies"
  ],
  "host_permissions": [
    "https://my.bobbinapp.com/*",
    "https://api.bobbinapp.com/api/*",
    "https://staging.bobbinapp.com/*",
    "https://staging-api.bobbinapp.com/api/*",
    "https://release.bobbinapp.com/*",
    "https://release-api.bobbinapp.com/api/*",
    "http://localhost/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://my.bobbinapp.com/*",
        "https://staging.bobbinapp.com/*",
        "https://release.bobbinapp.com/*",
        "http://localhost/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "bobbin@brikit.com"
    }
  }
}