All the following have time stamps less than two weeks old:
http://download.opensuse.org/repositories/mozilla/openSUSE_Leap_42.3/x86_64/... http://download.opensuse.org/repositories/mozilla/openSUSE_Leap_15.0/x86_64/... http://download.opensuse.org/repositories/mozilla/openSUSE_Leap_15.1/x86_64/... http://download.opensuse.org/repositories/mozilla/openSUSE_Tumbleweed/x86_64...
http://download.opensuse.org/repositories/mozilla/openSUSE_Leap_42.3/x86_64/... http://download.opensuse.org/repositories/mozilla/openSUSE_Leap_15.0/x86_64/... http://download.opensuse.org/repositories/mozilla/openSUSE_Leap_15.1/x86_64/... http://download.opensuse.org/repositories/mozilla/openSUSE_Tumbleweed/x86_64...
Apparently they are all getting frequent rebuilds. I checked the 15.1 52.9.0 changelog to find last entry was in June. Same for 15.1 2.49.4 was in July. Why are these and firefox-esr-branding, and same packages for 42.2 and 42.1 and libsoftokn3 and other related packages getting repeated rebuilds?.
I'm also puzzled why there are also mozilla:/ repos, which seem to exist mainly for hosting 52.x TB and various legacy builds. Why are they not in mozilla/ (without colon)?
BTW, 2.49.4 remains my primary browser, and 52.9 secondary, but I use others as well, e.g. Chromium (very little) and Newmoon (just started), plus older and newer FF versions (also not very much).