OpenSUSEs rolling release is called Tumbleweed. Before now i had not investigated much why i was not able to run the regular bootstrap script as i can in their stable (Leap) version.

wget -O bootstrap.py https://hg.mozilla.org/mozilla-central/raw-file/default/python/mozboot/bin/bootstrap.py && python3 bootstrap.py

One problem was that for some reason does Tumbleweed things abit different than Leap, like for sudo you need to add /usr/local/bin as a secure_path in the /etc/sudoers config file.

The secound problem was that you need to install Mercurial via sudo zypper in mercurial after bootstrap is run

Then things should work. Also i have verified that the regular way will work in the upcomming Leap (15.2) release coming in 15 days