Examine source code of Sendwin

{
  "name": "SendWin",
  "description": "Multi sessions!",
  "version": "3.10.12",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "./content-script.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    }
  ],
  "commands": {
    "_execute_browser_action": {
      "description": "__CMD_OPEN_SW__",
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      }
    },
    "bulk_temporary_session": {
      "description": "__CMD_NEW_BULK_SESSION__",
      "suggested_key": {
        "default": "Ctrl+Shift+F"
      }
    },
    "new_session": {
      "description": "__CMD_NEW_SESSION__",
      "suggested_key": {
        "default": "Ctrl+Shift+Z"
      }
    },
    "new_temporary_session": {
      "description": "__CMD_TEMP_SESSION_",
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      }
    }
  },
  "applications": {
    "gecko": {
      "id": "frfx@send.win",
      "strict_min_version": "91.1.0"
    }
  },
  "permissions": [
    "tabs",
    "activeTab",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "cookies",
    "storage",
    "contextMenus",
    "<all_urls>",
    "bookmarks",
    "notifications",
    "proxy",
    "contextualIdentities",
    "idle"
  ],
  "web_accessible_resources": [
    "wait.html",
    "app.html",
    "blocked.html",
    "web.js"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/icon-16.png",
      "32": "/images/icon-32.png",
      "48": "/images/icon-48.png",
      "128": "/images/icon-128.png"
    }
  },
  "icons": {
    "16": "/images/icon-16.png",
    "32": "/images/icon-32.png",
    "48": "/images/icon-48.png",
    "128": "/images/icon-128.png"
  }
}