Examine source code of KeeForm

{
  "name": "KeeForm",
  "description": "KeeForm - A simple KeePass form filler",
  "version": "5.0.3",
  "manifest_version": 3,
  "background": {
    "scripts": [
      "keeformext.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "keeform@keeform.org",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "142.0"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/icon.svg",
        "icons/tile96.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "19": "icons/icon19.png",
      "38": "icons/icon38.png"
    },
    "default_title": "KeeForm"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "permissions": [
    "webRequest",
    "webRequestAuthProvider",
    "storage",
    "scripting",
    "tabs",
    "notifications",
    "nativeMessaging",
    "webNavigation",
    "contextMenus"
  ],
  "options_ui": {
    "open_in_tab": true,
    "page": "options/options.html"
  }
}