Feature Request: Ability to include / exclude categories while browsing logs

Hi, 

It would be awesome to be able to include or exclude one or more categories of log entry types while using the log browser.  For example, I'd like to look at log data, but exclude Trackers.  Or, another example, I'd like to look at log data, but only see the "gambling" category.  This would be a welcome improvement making logs much more useful.