The phrase "different tabs" refers to separate sections or pages used for organizing and accessing multiple pieces of information or tasks at the same time. Full definition
They download the course material and open all the external resource pages on different tabs in order to read at their leisure, when Internet connectivity is low. (talentlms.com)
They open different tabs, accidentally close windows that had active shopping carts, or forget where they saw an item. (inc.com)
How many times do you open different tabs for clearing your doubts by searching almost anything on Google or any other search engine? (smallbusinessesdoitbetter.com)