Those who use the alternative servers browsers or the demo player for Quakelive have noticed that these useful tools were not working anymore after the last update released by id Software. Today most of them have been updated and the new versions are now functional again!

The alternative servers browsers are scripts which use the Greasemonkey Firefox add-on. In order to get the new versions working without a flaw, it's recommenced to uninstall the previous versions of these scripts. The demo player itself is an add-on and also requires to get the last version uninstalled.

Competition Server Browser 2.6.3: Download, ESR thread
Alt Server Browser 1.5.1: Download
Demo Player 1.3: Download, Official thread