M = Milestone, M91 is major version 91 More info at https://chromium.googlesource.com/chromium/src/+/refs/heads/main/docs/process/release_cycle_new.md https://c

M = Milestone, M91 is major version 91 More info at https://chromium.googlesource.com/chromium/src/+/refs/heads/main/docs/process/release_cycle_new.md https://chromium.googlesource.com/chromium/src/+/refs/heads/...