Repl.it is introducing support for tabs in its editing experience, allowing users to open files in new tabs and quickly switch between them. This feature can be accessed through various methods including Ctrl+Click (or Cmd+Click on MacOS), dragging files directly onto the header or an open tab, and right-clicking on a file to open it in a new tab. Users can also drag tabs around to reorder them, making it easier to build larger projects on Repl.it. The addition of this feature aims to improve the editing experience for users as their projects grow.