Can i safely uninstall Qgis 2.2 after I've installed the 2.4 version and keep my WFS and WMS features?
I'd rather be certain, so I don't have to setup the whole thing again.
Yes this is possible, you have a save button in the top right corner of the WFS window (same for WMS).
Use it to export your WMS/WFS and load them on the new version of QGIS.