You're probably thinking of rr: https://rr-project.org https://rr-project.org From the Pernosco FAQ: > What is the relationship between Pernosco and rr? > rr

You're probably thinking of rr: https://rr-project.org https://rr-project.org From the Pernosco FAQ: > What is the relationship between Pernosco and rr? > rr is a free software project founded by Mozilla. rr is an enabling technology for Pernosco, and rr maintainers founded Pernosco. We aim to maintain rr as free software with at least its current level of functionality.