AFAIK, the latest (non-ESR) versions need much newer devel packages (rust in particular) than available in 42.2. I suppose that’s the reason why they are not offered for 42.2 any longer, and it is one of the main reasons why the Leap updates follow the ESR versions.
You should get the latest 52ESR versions via standard updates anyway.
If you want/need a newer Firefox, either install it from mozilla.org directly or upgrade to 42.3. 42.2 will be out of support in 4 months anyway.
Is there a place where I can report it?
You can report it at http://bugzilla.opensuse.org/ (same username and password as here), component “Firefox”.
I have no idea whether this will help though…