Examine source code of FileShot - Secure File Sharing

{
  "manifest_version": 3,
  "name": "FileShot - Secure File Sharing",
  "short_name": "FileShot",
  "version": "1.3.0",
  "description": "Zero-knowledge encrypted file sharing. Drag & drop upload, screenshots, page media scanner, and instant share links.",
  "author": "FileShot.io",
  "homepage_url": "https://fileshot.io",
  "browser_specific_settings": {
    "gecko": {
      "id": "fileshot@fileshot.io",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "personallyIdentifyingInfo",
          "authenticationInfo",
          "websiteContent"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    },
    "default_title": "FileShot - Click to open",
    "default_popup": "popup/popup.html"
  },
  "sidebar_action": {
    "default_title": "FileShot",
    "default_panel": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "background": {
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "downloads",
    "clipboardWrite",
    "scripting",
    "tabs"
  ],
  "optional_permissions": [],
  "host_permissions": [
    "<all_urls>",
    "https://fileshot.io/*",
    "https://api.fileshot.io/*",
    "https://www.fileshot.io/*"
  ],
  "optional_host_permissions": [],
  "content_scripts": [
    {
      "matches": [
        "https://fileshot.io/*",
        "https://www.fileshot.io/*"
      ],
      "js": [
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_end"
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": false
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+U",
        "mac": "Command+Shift+U"
      },
      "description": "Open FileShot"
    },
    "capture_screenshot": {
      "suggested_key": {
        "default": "Alt+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Capture screenshot"
    },
    "capture_selection": {
      "suggested_key": {
        "default": "Alt+Shift+A",
        "mac": "Command+Shift+A"
      },
      "description": "Capture selection"
    }
  }
}