LibFrameFade is a World of Warcraft library that attempts to resolve UIFrameFade taint by reimplementing it to use the UI widget animation framework. This can help resolve issues such as "Interface action blocked by an addon" errors when attempting to perform actions such as joining battlegrounds or arenas in Classic Era or Burning Crusade Classic.
The design of the library is similar to LibChatAnims. You can either install it as a standalone addon, or embed it within another, and it will automatically manage UIFrameFade animations without any code changes required.
See the project repository for more information.