Load this test Tclet: http://pc.autons.net/stuff/tclets/bugexample.phtml and the Tclet loads.
Hit Reload and Firefox crashes with a Visual C++ error.
The script uses the Tk and Tktable packages. The Tcl Plugin is current (Version 3) and hasn't had any settings changes from default.
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Some more info:
It's not just reload. The Tcl Plugin causes the browser to crash the next time a page is loaded, whether the page has a Tclet or not.
Also, the problem also affects the Tcl Plugin when it's used within Safari 3.1 on Windows.
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The more I think about it, the more I think the common ground is my Tclet's use of Tktable in the Tcl Plugin. I've not seen any other Tclets on the web using Tktable to organise data. They tend to use the canvas or pack/grid.