How to change a thumbnail in Top Sites
(Using Safari 7)
I know I can drag a URL to the Top Sites page to add it, but invaribly it does not add the thumbnail I want. A good example of this is the Google Calendar. If I have the calendar open and drag the URL to Top Sites I get a thumbnail of the Google login page, which doesn't accurately depict the content. This used to happen with Facebook, but mysteriously that finally changed to an actual Facebook page thumbnail. This was never a problem with previous versions of Safari, so wondering if there's a way to force a page thumbnail onto the Top Sites page in Safari 7. Thanks for any help.
iMac, OS X Mavericks (10.9)