prepare for macOS 10.9, 10.10, and 10.11 end of life
From #33534 (closed): Firefox 78 is the last major release (and presumably the last ESR release) that will support macOS versions 10.9, 10.10 and 10.11. We need to encourage our macOS Tor Browser users to upgrade their OS soon (and potentially their Mac hardware if it does not support at least macOS 10.12).
Edited by Georg Koppen