Examine source code of Roblox Profile Notes

{
  "manifest_version": 2,
  "name": "Roblox Profile Notes",
  "version": "1.1.1",
  "description": "Add and save custom notes to individual Roblox profiles! Click on the extension icon to view and import/export all of your notes.",
  "permissions": [
    "storage",
    "*://*.roblox.com/v1/users/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.roblox.com/users/*/profile*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "roblox-profile-notes@projects.char.kim"
    }
  }
}