Quote from the original Project Page:

This small addon adds the quest's level in front of it's name. Nothing more, nothing less. This isn't done by replacing the whole functions of the quest log. Instead it intercepts the call of the function returning the quests name, level, ... It then prefixes the name with the level. That's all. By doing so, it also works for the built in quest tracker.

What's new in v2.6:

• Fixed a bug in the "suggested Player" caching.