Diagnosis
You have attempted to delete a content provider from the area of thepreselected content providers. Since this content provider is currentlyloaded in the browser in tab "Research", it therefore cannot bedeleted.

System Response
Deletion blocked as long as content provider is loaded.

Procedure
Go to tab page "Research". Load another content provider that you donot intend to delete, or initialize the browser by deleting the fieldfor the content provider or the URL address and pressing ENTER.
Then, return to the preselection of content providers. Now you can makethe deletions you originally intended.