Page Manipulator

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Page Manipulator",
  "version": "0.5.5",
  "description": "Inject HTML, CSS or JavaScript into any web-page. The changes you make are applied every time you visit the specified website(s).",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "action": {
    "default_icon": "icon16.png",
    "default_popup": "popup.html",
    "default_title": "Page Manipulator"
  },
  "background": {
    "service_worker": "eventpage.js"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "match_about_blank": true
    }
  ],
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus",
    "unlimitedStorage"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "receiver.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}