I've been using the Firefox mod Zen Browser on Linux Mint. When Firefox released an update in February, my Zen had it the next day. People depending on the "official" Firefox were left waiting over a week, with multiple threads in the forums asking "when is it coming?"
Also when I looked into mods updates for a critical security fix in November, practically all the mods had updated within 24 hours of FF's update. (Exceptions: Midori and Mercury.) https://forums.linuxmint.com/viewtopic.php?p=2554267&sid=4f140800c5d62939af8e6394514b9aab#p2554267
https://github.com/imsnif/diskonaut
No package for my distro, I "installed" an AppImage with AM (which is also how I discovered it)