Copied from AMO:

> Add-ons submitted to Mozilla Add-ons must have an install.rdf file with at least one of the below applications supported. Only the versions listed below are allowed for these applications.

AMO currently supports Fx, Tb, SM, Fx for Androif and Fennec.
And for Fx it supports the following recent versions:

> ..., 22.0a1, 22.0a2, 22.0, 22.*, 23.0a1, 23.0a2, 23.0

Please note it doesn't support `23.*` yet, for example!