Examine source code of :3

{
  "manifest_version": 3,
  "name": ":3",
  "short_name": ":3",
  "version": "1.8",
  "description": "Adds cute emoticons to the end of text on every website! Features cursor particles, customizable emoticons, and a cute UI.",
  "author": "Deviver",
  "homepage_url": "https://deviver.art",
  "permissions": [
    "storage",
    "tabs",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icon_16x16_v1.png",
    "48": "icon_48x48_v1.png",
    "128": "icon_128x128_v1.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": ":3",
    "default_icon": {
      "16": "icon_16x16_v1.png",
      "48": "icon_48x48_v1.png",
      "128": "icon_128x128_v1.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "browser-polyfill.min.js",
        "content_script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "emoticon-extension@deviver.art",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}