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Zen: On one machine, Flatpak. On the other, AppImage through AM. Firefox: Mint-maintained version from Mint repo (deb).

I can't remember the exact differences between Firefox upstream and Mint version. But I believe Mint began maintaining their own deb at a time when upstream Ubuntu was only offering Firefox as a snap, which Mint is against, and Mozilla hadn't yet begun offering their own deb repo.

https://github.com/imsnif/diskonaut

No package for my distro, I "installed" an AppImage with AM (which is also how I discovered it)

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

"Zen is no good if you care about privacy."

How so?

Used Webkit until 2019, then bought out and now based on Firefox/Gecko.

There are tools to update AppImages, like AM and Gear Lever.

Well, you can get Bottles as an AppImage... unofficially https://github.com/ivan-hc/Bottles-appimage

Personally I'm loving diskonaut. "Graphical" representation but at, ahem, terminal velocity.