manifest.json

{
    "name": "Grammarly with Ghost",
    "version": "1.0.2",
    "description": "Allow Grammarly to work on Ghost's editor",
    "manifest_version": 3,
    "action": {
      "default_icon": {
        "16": "assets/images/icon16.png",
        "24": "assets/images/icon24.png",
        "32": "assets/images/icon32.png"
      },
      "default_title": "Grammarly With Ghost",
      "default_popup": "popup.html"
    },
    "permissions": [
        "storage",
        "tabs"
    ],
    "content_scripts": [
        {
          "matches": ["<all_urls>"],
          "run_at": "document_end",
          "js": ["assets/js/contentScript.js"]
        }
    ],
    "icons": {
        "16": "/assets/images/icon16.png",
        "32": "/assets/images/icon32.png",
        "48": "/assets/images/icon48.png",
        "128": "/assets/images/icon128.png"
    }
  }