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There's keyconfig extension (it's not available on addons.mozilla.org) that could help you.

Thanks!

Ctrl-tab and ctrl-shift-tab are the built-in ways to do that, if that's any help.

I'm not sure about remapping hotkeys. In OSX, command+shift+] is next tab and command+shift+[ is previous tab.

maby try firegestures? allow you to map tab to mouse button