Two-Factor Authentication documentation page is outdated - now not only Chrome [docs]
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Documents Two-Factor Authentication
New doc or update?
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New documentation -
Update existing documentation
Actual bug report
https://gitlab.com/help/user/profile/account/two_factor_authentication claims that "U2F workflow is only supported by Google Chrome at this point"
According to https://caniuse.com/#search=U2F it is supported also by Opera and Firefox (though in Firefox it is disabled by default).
It seems that https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/user/profile/account/two_factor_authentication.md is a relevant file.