Examine source code of popup2tab

{
  "name": "Open link in same tab, pop-up as tab",
  "short_name": "popup2tab",
  "description": "Forces Chrome to open new tabs instead of pop-up windows and/or links in the same tab by default instead of new or background tab.",
  "version": "3.3.0",
  "manifest_version": 3,
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "images/icon48.png",
    "96": "images/icon96.png",
    "128": "images/icon128.png",
    "256": "images/icon256.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "style/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_icon": "images/icon48.png",
    "default_popup": "popup.html",
    "default_title": "Open link in same tab, pop-up as tab [Free]"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "popup2tab@wrty.eu",
      "strict_min_version": "58.0"
    }
  }
}