Now available via extraQL's Userscripts --> Script Management view.

* Filtering (click "Flexible Filter" or hit Shift+F)
* Persistent sorting and filtering
* Redesigned table-based server list
* Custom column ordering (via "Custom Columns" menu item)
* Shift+R to refresh the list
* Other tweaks

Code-wise there isn't much in common with QLNAB, so there are likely some bugs to work out.