We (the "広辞苑無料検索" service) provide a "User Config" system which allow users to modify or customize every aspects of their experiences using our service.
The User Config system is fairly complex, contains dozens of configurable parameters. While most parameters have reasonable default values, advanced users ("power users") could modify these parameters to enhance their experiences or better fit their personal preferences or needs.
We plan to provide some help document here about the User Config system of our service here.