I actually find the tabs really helpful. So do a lot of people who use the application. They allow you to just focus on the requests you want. Say you're working on a project. You don't want to keep searching for your request in a collection 100 when you only need 2 or 3 to do your work.

I will consider adding a toggle in the Settings to disable tabs for people who don't find this useful.

As a user, sometimes I want those tabs for the shortcut they provide.. but other times I want to get there for the history (response). And when I run out of space width, I close the less relevant tabs.

I can't yet articulate what's always perfect for me, but I can say there are different reasons/moods for wanting quick navigation to prior tabs/calls.