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In fact even if you close your browser, it makes you have to use 2fa again.
Chromebook Extensions
Chrome extensions are found in the Chrome Web Store. Extensions primarily add functionality to the Chrome web browser. Once installed, they can be found in the upper right of the Chrome browser under the puzzle icon.
Extensions Knits itself into your browser
It sees all the traffic your generating before it gets encrypted and it sees all the stuff that comes back into your browser after it is decrypted
Anything like HTTPS or TLS encryption is irrelevant to the extension.
It's inside your browser and it kinda has equivalent power to your browser
Be Very very conservative about the stuff you plug into your browser to give extra functionality.
Google Marketplace Apps
Marketplace Apps are found in the G Suite Marketplace. Apps primarily add functionality to individual products such as Docs, Sheets or Slides. Once installed they can be found under the Add Ons menu of whatever service is being used (ie- Google Docs, Google Sheets, etc.)