Addition of a "tab" button on the Firefox focus browser

Components

Firefox focus is an Android browser app that helps user surf the web with an additional privacy feature, example,it deletes browser history after every browsing

Proposal

There should be a tab button for user to be able to multitask and work on different websites at the same time

Mockups / Examples

There should be a tab button here:

Like this one below:

Benefits

This would help user to be able to toggle between multiple webpage at the same time and efficiently help users to multitask while using the FireFox focus browser !