User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:33.0) Gecko/20100101
Firefox/33.0
Build Identifier: 

The only way to get rid of this error is to completely remove the offending
applications. Nothing else works.

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linux-m086:/home # zypper ve
Loading repository data...
Reading installed packages...

Problem: nothing provides appdata(firefox.appdata.xml) needed by
application:Firefox-.noarch
 Solution 1: deinstallation of application:Firefox-.noarch
 Solution 2: break application:Firefox-.noarch by ignoring some of its
dependencies

Choose from above solutions by number or cancel [1/2/c] (c):

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Pressing (1) doesn't do anything.

In this case it only goes away after removing all the MozillaFirefox rpms.

Reproducible: Always