Examine source code of Open Link and New Tab Next to Current

{
  "name": "Open Link and New Tab Next to Current",
  "description": "Open new tabs and links next to your current tab instead of at the end of the tab bar.",
  "short_name": "Next to current",
  "homepage_url": "https://github.com/johanhs/open-link-and-new-tab-next-to-current",
  "version": "1.0",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "{b2c8ed28-4fd4-28f8-b7d4-2d8c793b1a59}",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "16": "assets/icon16.png",
    "32": "assets/icon32.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "background": {
    "scripts": [
      "serviceWorker/serviceWorker.js"
    ],
    "type": "module"
  },
  "commands": {
    "open-new-tab-next-to-current": {
      "description": "Open new tab next to current",
      "suggested_key": {
        "mac": "MacCtrl+R",
        "windows": "Ctrl+R",
        "linux": "Ctrl+R"
      }
    },
    "open-link-at-cursor-in-new-tab": {
      "description": "Open link at cursor in new tab next to current",
      "suggested_key": {
        "default": "Alt+R",
        "mac": "Alt+R",
        "windows": "Alt+R",
        "linux": "Alt+R"
      }
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "permissions": [
    "storage",
    "scripting",
    "activeTab",
    "webNavigation"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "utils/zgetURLAtCursor.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}