Add Firefox Nightly to opensuse tumbleweed

Opensuse Tumbleweed does not have 32bit -57 in the repos. In the absence, I would like to add Firefox Nightly but can not find a tutorial on how to do this. Can anyone help me out?

You can get 32-bit version of Firefox from this page (Nightly from here). Here are the instructions, how to install Firefox from the downloaded archive.