First, the "Mozilla < 1.3.Beta" issue is a result of using HTMLarea, which is outdated. It's been removed in the v1.5.0 release, with the suggestion that you install the CKEditor addon from the Addons area instead.

Second, v1.3.9g, and maybe 1.3.9f?, had a bug that was fixed in v1.3.9h that would cause product names/descriptions to not show on-screen when going into edit mode, if an old version of PHP was in use. Upgrading to v1.3.9h fixes that issue.