Never Too Late To Learn `multi-occur-in-matching-buffers'

Ever wanted to search all of your buffers limited by their backing file type? Surprisingly I never did very much. ag and grep worked fine for me. Then I started leaving buffers open, with everything that I cared about, all the time. Then I joined the “Emacs 100+ Buffer Club”.

multi-occur-in-matching-buffers is helpful when you watch to use occur in some of those buffers.