Now it works. :) I have removed my_old_app.xpt and my_old_app.dll from plugins and components folders. I had older version of my app installed. Although older version had different GUIDs (UUIDs) it had same names for classes. In the beginning two versions co-existed, but at some point newer version refuse to work if older is present. :( Does this mean there can't exist several (older and newer) versions of the same app (XPCOM scriptable plugin) in Firefox 1.0.4?
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