Examine source code of MogClick

{
  "manifest_version": 2,
  "name": "MogClick",
  "version": "2.5",
  "description": "Add right click/new tab on click functionality for FFXIV's MogStation storefront.",
  "icons": {
    "48": "icons/mog48.png",
    "96": "icons/mog96.png",
    "128": "icons/mog128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://store.finalfantasyxiv.com/ffxivstore/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "mogclick.js"
  ]
}