Examine source code of Send to PressReleased

{
  "manifest_version": 3,
  "name": "Send to PressReleased",
  "version": "3.5",
  "description": "Bypasses paywalls using PressReleased reader API.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://pressreleased.alwaysdata.net/"
  ],
  "action": {},
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pressreleased-reader@yourdomain.com",
      "strict_min_version": "120.0"
    }
  }
}