After upgrading to the beta of Opera 10.5, I noticed that regular cookie-settings didn't seem to apply on the
new
webstorage and webdatabases. Because I hate cookies (the electronic one at least), I started looking for a way to
disable them.
There are many settings in opera:config#PersistentStorage.
Sadly most of them are not documented (yet) and some were not self-explaining. Trial and error told me that it is
basically sufficient and not bad to set all of the value to "0". If you want to be a bit more selective, you could leave
the value for SQLQueryExecutionTimeout as is.
It seems that if you disabled this all, you'll still get entries
in opera:webdatabases or opera:webstorage which can be a
good thing if you want to enable it later for a specific site that needs this and where you are OK with it. In this case
just go to either of the two sites and tweak the settings.