Examine source code of Mr. Check

{
  "manifest_version": 2,
  "name": "Mr Check",
  "version": "1.2",
  "description": "Automatically checks the squash and delete branch boxes on new GitLab merge requests",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://gitlab.podium.com/*/merge_requests/new*",
        "*://gitlab.podium.com/*/merge_requests/*/edit"
      ],
      "js": [
        "mr-check.js"
      ]
    }
  ]
}