It's disabled by default, but I had no idea this was added.
Firefox mobile users started noticing something peculiar this week when sharing links to WhatsApp. After hitting that share button, their messages were getting an unexpected tagline: βSent from Firefox π¦β with a direct link to the Mozilla app store listing.
The feature appeared quietly, with no fanfare or announcement from Mozilla.
https://piunikaweb.com/2025/11/26/sent-from-firefox-whatsapp-share-signature/
Honestly I think that is fine
It is also only for Whatsapp, so specific to a platform with high userbase that doesnt know shit about fuck
I dont even know how a browser determines that, I just copy a link and paste it somewhere
So very low impact feature, I think it is fine
(What is not fine is their new menu redesign, which makes the process objectively slower, adds useless clutter to the view and is less usable with one hand)
Itβs opt-out.
For me, it was opt in, turned off by default. Apparently it's turned on if you opt in to studies, but I definitely never do.
Interesting, I was enrolled in a bunch of stuff on Android, but off on iOS.
(was)