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Offline mode works in a browser tab too.

yes, but not at app.fastmail.com unfortunately.

Have you tried it lately? The webworker tech they added for the browser is almost definitely why this app exists at all.

my bad, had to enable it in settings...

I've had it for a while actually. Maybe they are rolling it out slowly?

Oh... my bad ! Turns out it was disabled by default... so yes, one less reason to use the standalone app.