New Windows 11 shortcut for en/em dash not working in Firefox/Thunderbird?

[NoLlama]

There's a new feature in the recent 25H2 Windows 11 update: you can now type an en dash (–) / em dash (—) using Winkey + hyphen(-) / Winkey + Shift + hyphen(-) keyboard shortcuts respectively.

This works in just about every application I tried it, except for Mozilla Firefox and Thunderbird. I tried this on two different PCs, one at work and one at home. Can someone confirm this is the case?

Is Firefox somehow catching this system-wide shortcut? Can this be fixed?

[siffemcon]

Verified - I'll file a bug.

Got a bug almost filed and decided to check FF Nightly and Beta. It works on them, so it should work on FF release within a few weeks. It doesn't work on TB Beta though, so it may be more than a few weeks for TB.