I received the update error below. After which a new Firefox update was received and installed successfully. Is this a problem?
Update Error
File ‘./x86_64/MozillaFirefox-78.5.0-lp152.2.30.1_lp152.2.33.1.x86_64.drpm’ not found on medium ‘http://download.opensuse.org/update/leap/15.2/oss/’
It may have been a temporary glitch, but you seem to have updated anyway. So it should not be a problem for you.
Typically, there is a delta update (just the changes from previous version) and a complete new package with the new version. From your description, it seems that there was a problem with the delta, so the full package was used instead.
The likely cause – a temporarily defective mirror.