In HTML5 Annotation Viewer, immediately after making an annotation, have the cursor automatically default back to the selection/pointer tool.
Defaulting the cursor back to the selection/pointer tool after making an annotation is the standard functionality of Adobe Acrobat, which most people are accustomed to. Currently the tool remains what it is until the user manually changes it. This results in many accidental annotations that you must delete one by one. This makes reviews take longer, especially for occasional users.
If you make this change, then you don't have to have the annotation pop-up window open every time, which you then have to close, even when you don't need it. I believe that this is the best user experience, validated by Adobe.
Customer support service by UserEcho