I can not confirm this, when I compile the plugin and copy it to /usr/lib/mozilla/plugins/ the example page works as expected.
Are you running the plugin on the same system that compiled it?
If not, does the system have the Qt libraries installed (libqt4-gui)?
Is there any output from the command line when you run firefox from there?
I can not confirm this, when I compile the plugin and copy it to /usr/lib/ mozilla/ plugins/ the example page works as expected.
Are you running the plugin on the same system that compiled it?
If not, does the system have the Qt libraries installed (libqt4-gui)?
Is there any output from the command line when you run firefox from there?