Examine source code of Bitbucket PR auto delete source branch

{
  "manifest_version": 3,
  "name": "Bitbucket PR auto delete source branch",
  "description": "Automatically checks the checkbox to delete the current branch after the pull request is merged on Bitbucket Cloud. This extension automatically checks the checkbox to delete the source branch in a Bitbucket Pull Request after merging it into the destination branch. Developers may forget to check this checkbox when creating a Pull Request, leaving the stale merged branches in the remote. This functionality is available as a native configuration in Bitbucket Server, but it is not available in Bitbucket Cloud, so this extension solves that problem. This is a port of the Google Chrome extension \"Bitbucket Pull Request auto delete branch\"!",
  "version": "0.0.4",
  "author": "Steffen Haase",
  "developer": {
    "name": "Steffen Haase (SHWorX)",
    "url": "https://github.com/SHWorX/bitbucket-pr-auto-delete-source-branch"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e2297524-1933-4c45-9bcc-ea3edb4fc83e}",
      "strict_min_version": "109.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://bitbucket.org/*/pull-requests/new*"
      ],
      "js": [
        "content_script.js",
        "debug.js"
      ]
    }
  ],
  "permissions": [
    "webRequest"
  ],
  "icons": {
    "16": "icons/logo16.png",
    "32": "icons/logo32.png",
    "48": "icons/logo48.png",
    "128": "icons/logo128.png"
  }
}