Pottencially it is desirable to use browser tabs as they are closer to the user browsing experience, BUT if you are building your own web app then you should better implement your own tab system within your app because for your user it would be easier to use and keep focused on. Using browser tabs will disrupt your user experience within your web app, much more if he/she has some other web apps or web sites opened in the same browser.

Potentially, it is desirable to use browser tabs, as they are closer to the user browsing experience, BUT if you are building your own web app then you would be better to implement your own tab system within your app, because for your user, it would be easier to use and keep focused on.

Using browser tabs will disrupt your user's experience within your web app, especially if he/she has some other web apps or web sites open in the same browser.