🅱️

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "🅱️",
  "description": "Replace the letter B with the 🅱️ emoji everywhere.",
  "version": "2.0",
  "manifest_version": 3,
  "background": {
    "service_worker": "background.js"
  },
  "action": {},
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "mutation-summary.js",
        "main.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "tabs"
  ],
  "icons": {
    "128": "./assets/b.png"
  }
}