To bring issues into the 21st century (and a secure website) - you can now use our github tracker.
Up until recently, quickFilters used Bugzilla to maintain information on all bugs. With bug trackers it is relatively easy to submit a bug report or upload screen shots, you will have to create a free account with bugzilla to do this. As with a lot of the Software under the Mozilla development envelope this is also a very community driven experience, the more people contribute the better and more efficient work on future versions of quickFilters will be.
To raise or comment on a bug you have to have a user account at mozdev.org - I prefer if you use the new github issue tracker for now.