Examine source code of Music Finder

{
  "manifest_version": 3,
  "name": "Music Finder",
  "version": "1.0.0",
  "optional_permissions": [
    "<all_urls>",
    "activeTab"
  ],
  "permissions": [
    "storage",
    "activeTab"
  ],
  "description": "Recognizes the song playing on the active tab.",
  "action": {
    "default_icon": "icons/border-48.png",
    "default_title": "Music Finder",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cc906b2c-519d-4e6c-a8cd-0b9f4d3b6516}"
    }
  },
  "icons": {
    "48": "icons/border-48.png",
    "96": "icons/border-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*"
      ],
      "js": [
        "borderify.js"
      ]
    },
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "js": [
        "cs.js"
      ],
      "all_frames": true,
      "match_about_blank": true
    }
  ]
}