I can no longer open Firefox from the share sheet on my iPad or iPhone (both running iPadOS/iOS 18.2). I tap on the Firefox icon in the share sheet in some other app and nothing happens. Interestingly if I tap on Firefox Focus (v133.0) instead of Firefox (v133.3) in the share sheet then Focus opens fine.

I'm not sure if this problem is related to iOS/iPadOS 18.2 or Firefox 133.3 as they came out close together and I didn't notice the problem until I was running both. Prior to upgrading Firefox and iPadOS/iOS share sheet launching was working fine.