This question is in reference to Atlassian Documentation: https://confluence.atlassian.com/pages/viewpage.action?pageId=777023203
Firefox supports U2F, when will I be able to use my security key with bitbucket/other Atlassian products? https://addons.mozilla.org/en-US/firefox/addon/u2f-support-add-on/
Luckily Bitbucket Cloud gained U2F support a few weeks ago already, see Universal 2nd Factor (U2F) now supported in Bitbucket Cloud for details.
I'm not aware of any current U2F initiatives regarding other Atlassian products, though there more general 2FA related issues where U2F has at least been mentioned in the comments already:
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