Examine source code of Pixel emojis

{
  "manifest_version": 3,
  "name": "Emoji Replacer",
  "version": "2.8",
  "description": "Replace some emojis with the old pixelated Softbank emojis",
  "permissions": [],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "imgs/*.gif"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon.png"
  },
  "action": {
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon.png"
    },
    "default_title": "Emoji Replacer"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "emoji-replacer@nadz.dev"
    }
  }
}