Examine source code of What The Merge

{
  "manifest_version": 2,
  "name": "What The Merge",
  "version": "1.0.0",
  "description": "Adds a button to GitHub's Pull Request UI for certain Odoo repositories (odoo/enterprise/upgrade) that redirects the user to the mergebot dashboard of the corresponding PR.",
  "icons": {
    "48": "icons/robot.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://github.com/odoo/odoo/pull/*",
        "*://github.com/odoo/enterprise/pull/*",
        "*://github.com/odoo/upgrade/pull/*"
      ],
      "js": [
        "wtm.js"
      ]
    }
  ]
}