Examine source code of Waymark

{
  "manifest_version": 2,
  "name": "Waymark",
  "version": "1.0.1",
  "description": "Drop pins anywhere on a page. One-time or saved permanently.",
  "browser_specific_settings": {
    "gecko": {
      "id": "waymark@jimmex.vercel.app",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "bookmarks",
    "tabs",
    "<all_urls>",
    "file:///*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Waymark",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "commands": {
    "mark-spot": {
      "suggested_key": {
        "default": "Alt+M"
      },
      "description": "Mark this spot (one-time)"
    },
    "save-spot": {
      "suggested_key": {
        "default": "Alt+S"
      },
      "description": "Save this spot (permanent)"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>",
        "file:///*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "web_accessible_resources": [
    "fonts/*"
  ]
}