It seems that a change in Firefox 17 broke the windowed mode of Quake Live. Whenever one tries to join a game, nothing displays in the designated are within the browser, but the game works since sounds can be heard. That seems to be caused by a regression in Firefox tracked in this bug report. Fortunately there is a dedicated browser bundle called QLPrism. It's made by the folks at www.qlprism.us. QLPrism is an older version of Firefox that directly launches the Quake Live web site. It also features a few nice additions such as a customized match browser. So in short, to get Quake Live working again:
I tried QLPrism as a workaround to the Firefox bug, but now I like it better than using the standard browser!
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