How to disable FireFox's "back" mouse-button command?

[ShadowTek]

I have assigned one of my mouse buttons to a command that I regularly use via btnx, but it seems that this mouse-button is already reserved within FireFox for its "back" command.

How do I disable FireFox's use of this mouse-button?

[silentknyght]

I have assigned one of my mouse buttons to a command that I regularly use via btnx, but it seems that this mouse-button is already reserved within FireFox for its "back" command.

How do I disable FireFox's use of this mouse-button?

I've been searching all morning and have been unable to find anything on this topic, myself. I have found a host of irate Windows users complaining that Mozilla has been sitting on their hands with regard to the inability to unmap these keys for a few years:

http://support.mozilla.com/tiki-view_forum_thread.php?locale=en-US&forumId=1&comments_threshold=0&comments_parentI d=13623&comments_offset=40&comments_per_page=20&th read_style=commentStyle_plain

This suggests to me that it doesn't exist natively and that Mozilla doesn't really care to address it.