Examine source code of Focus mocus

{
  "icons": {
    "16": "icon16.plasmo.2577fc03.png",
    "32": "icon32.plasmo.d583dc1e.png",
    "48": "icon48.plasmo.e0fcfb1d.png",
    "64": "icon64.plasmo.e6259081.png",
    "128": "icon128.plasmo.96a1ede9.png"
  },
  "manifest_version": 3,
  "action": {
    "default_icon": {
      "16": "icon16.plasmo.2577fc03.png",
      "32": "icon32.plasmo.d583dc1e.png",
      "48": "icon48.plasmo.e0fcfb1d.png",
      "64": "icon64.plasmo.e6259081.png",
      "128": "icon128.plasmo.96a1ede9.png"
    },
    "default_popup": "popup.html"
  },
  "version": "1.1.0",
  "author": "Kaustubh Walokar <kaustubh.walokar@gmail.com>",
  "name": "Focus mocus",
  "description": "",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "mouse-comp.29d554c8.js"
      ],
      "css": [
        "mouse-comp.726b78ce.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "focus-mocus@kaustubh.com"
    }
  },
  "web_accessible_resources": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "resources": [
        "mouse-comp.6b9b684b.png"
      ]
    }
  ]
}