Examine source code of Autolinker Github/Jira

{
  "manifest_version": 3,
  "name": "Auto-linker Github/Jira",
  "version": "1.2",
  "description": "Change the Jira Tickets to links in the Github Pull Requests Title",
  "action": {
    "default_popup": "settings/settings.html"
  },
  "options_ui": {
    "page": "settings/settings.html"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "jira.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "autolinker@extension.com"
    }
  }
}