Examine source code of PS Inspector

{
  "manifest_version": 3,
  "name": "PS Inspector",
  "version": "1.0",
  "description": "Opens a side panel in Firefox to enable inspection of PeopleSoft application fields.",
  "browser_specific_settings": {
    "gecko": {
      "id": "ps-inspector-ext@schenkee",
      "strict_min_version": "142.0",
      "homepage_url": "https://github.com/Schenkee/PS-Inspector",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "icons": {
    "48": "icons/main-48.png",
    "96": "icons/main-96.png",
    "128": "icons/main-128.png"
  },
  "sidebar_action": {
    "default_icon": "icons/main-48.png",
    "default_title": "PS Inspector",
    "default_panel": "sidepanel/panel.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "48": "icons/main-48.png",
      "96": "icons/main-96.png"
    },
    "default_title": "PS Inspector"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/psp/*/*/*/*/*",
        "*://*/psc/*/*/*/*/*"
      ],
      "js": [
        "content_scripts/psinfo.js",
        "content_scripts/fieldinspect.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/red_inspect.png",
        "icons/blue_inspect.png"
      ],
      "matches": [
        "*://*/psp/*/*/*/*/*",
        "*://*/psc/*/*/*/*/*"
      ]
    }
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      }
    }
  }
}