Mobile Safari does, actually. For example, I’m using nostore to manage my nostr keys.
Discussion
Nostore yes but GetAlby....
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That’s up to Alby, not Apple/iOS.
I don't think so, Firefox on iOS does not allow for extensions because of Apple store policies. If there is another way though...
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Which depends on GetAlby, like #[3] correctly says, Safari for iOS and iPadOS support extensions.
#[2] ?
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We have started on this, but it will still take some time.
If somebody wants to contribute: https://github.com/getAlby/lightning-browser-extension