@anon

i rarely bother to fill in thumbnails, i mean why it don' check my most visited sites and take bookmarks from there.
it could update automatic without my intervention

Please have a look at this thread.
You may find it of interest

Then you could try running Fast Dial Version 2.14, and then make most visited sites your home page, if that is what you want

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See now also
Using Fast Dial like Google Chrome (Most Visited sites)