Grey background appears behind some content in FireFox

Problem:  When viewing materials in FireFox, the white background sometimes does not extend far enough down.  This causes text to be presented on a grey background and thus be less readable.

Solution:  As a workaround, using Chrome or another supported browser when viewing a course appears to address this issue.  In the meantime, we are attempting to document replication steps which can be provided to the vendor for a resolution.