Version 1.2 of the Preview HTML plugin has been released.
By default, the plugin waits for 1000 ms (= 1 second), but this can be adjusted by creating a settings file "$(PLUGINSCONFIG)\PreviewHTML\Settings.ini", and adding the following lines to it, replacing 1000 by the number of milliseconds you want it to wait.
If you want to disable the autorefresh, specify an interval of 0 ms.
What does the plugin do:
Preview HTML files inside Notepad++ (or in a floating window) without having to save them first.