Install the `tabbar` package using `M-x package-list-packages` or by adding `(use-package tabbar :ensure t)` to your init file and evaling it. To change what buffers show in a bar you can point `tabbar-buffer-groups-function` at a function of your own devising (`C-h v tabbar-buffer-groups-function`) patterned off the default `tabbar-buffer-groups` (`C-h f tabbar-buffer-groups` and follow the link to its definition in `tabbar.el`).
That said, instead of tabs, I recommend getting used to something like helm. When you have 150 files open even windowing and LRU won't help you enough. Switching to buffers by typing in a few characters of their name and then hitting enter can be done open-loop and not having to find things with your eyes is a major speedup.
That said, instead of tabs, I recommend getting used to something like helm. When you have 150 files open even windowing and LRU won't help you enough. Switching to buffers by typing in a few characters of their name and then hitting enter can be done open-loop and not having to find things with your eyes is a major speedup.