Since the update of the webclipper this does not work anymore:
when I had clipped a webpage, then the clipped note opens in a new local (!) Evernote window, so that I can file it in my desired Evernote notebook.
At the moment it is filed automatically in the standard notebook. So I need an extra step: going to my local Evernote, going into the standard notebook and filing the clipped note into the right notebook.
This happens ALTHOUGH I have set the Evernote (for Windows 7) settings to "open clipped note in a new window"!!

(Firefox 50.0, newest Evernote for Windows 7)