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Double clicking a component does nothing, and after trying I am unable to place new components (can get them from the panel at left, but they won't let go of the mouse cursor until I Esc, then they disappear). This is in Firefox 4.0 (newest version I'm allowed to install at work). Good idea, but not playing for me....

Hi @bwaslo,

Thanks for reporting this. There was a bug on our end that caused an issue on older versions of Firefox. That has been fixed, and the editor should work properly on Firefox 4 now.

CircuitLab runs substantially faster and smoother on newer browsers, so when possible we do recommend you use the latest version.