Years ago I wrote about a Firefox extension that allows you to start an Xdebug debugging session by clicking on an icon in Firefox' status bar. For some unexplained reason, this extension is no longer available through Firefox' addon-site. Although I have a copy at http://xdebug.org/files/xdebug_helper-0.3.1-fx.xpi for archival purposes, there are now a few other browser extensions that do the same thing.
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