Examine source code of Github Org Project Link

{
  "manifest_version": 2,
  "name": "Github Org Project Link",
  "version": "1.1",
  "description": "Adds an additional link to github organization repositories that takes you to the organization's project pages",
  "browser_specific_settings": {
    "gecko": {
      "id": "github-org-project-link@devolotl",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icons/kanban.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*",
        "*://github.com/*"
      ],
      "js": [
        "github-org-project-link.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/kanban.png"
  ]
}