If you change the blacklist provider the old Block categories remain. They should be deleted because the new provider probably has new categories. Maybe a reset button also make sense. So you are able to delete the categories without changing the provider.
(In reply to Daniel Weismüller from comment #0) > If you change the blacklist provider the old Block categories remain. > > They should be deleted because the new provider probably has new categories. > Maybe a reset button also make sense. So you are able to delete the > categories without changing the provider. What is not so simple is that any user provided blacklists add their categories also and all stored in the same location. So if all the categories are removed you will also remove the user provided blacklists, which probably would not be the intent. So the coding probably needs to be modified to differentiate between providers because they could have categories with the same name, and also with potentially more than one user provided blacklist. There is already a bug report covering this issue in bug#13820 *** This bug has been marked as a duplicate of bug 13820 ***