When I installed the toolbar it already wasn't supported any more. For some reason or another I managed at the time to install it and make it work. Have no clue why it doesn't install this time, but I will have to accept the fact that I don't manage to get it to work on the other computers. But on the computer it is installed on, I have a GPS position on all major mapping sites indicated. A real pity that you don't support that plug in any more!
However that doesn't change the fact that the "GPS in Browser" feature refuses to work on all map sites indicated by you apart from your site http://gpsgate.com/demo/gpsinbrows2.html
where it does work.
If you want to see what I might be doing wrong, you can remotely access the computer that I am trying this on, using UltraVNC. Just send me an email "off forum" for the access password and the IP address.