Examine source code of tall.ly

{
  "manifest_version": 3,
  "name": "tall.ly",
  "description": "Manage and share your bookmarks",
  "version": "0.0.7",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "optional_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    },
    {
      "js": [
        "tallly.js"
      ],
      "matches": [
        "https://tall.ly/*"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@tall.ly"
    }
  }
}