Default smart bookmarks (for those that incidentally deleted them):
Most Visited
place:queryType=0&sort=8&maxResults=10
Recently Bookmarked
place:folder=BOOKMARKS_MENU&folder=UNFILED_BOOKMARKS&folder=TOOLBAR&queryType=1&sort=12&excludeItemIfParentHasAnnotation=livemark%2FfeedURI&maxResults=10&excludeQueries=1
Recent Tags
place:type=6&sort=14&maxResults=10
Creating a Smart Bookmark
There are a few different ways that you can create a Smart Bookmark, but I’m going to show you the one that I believe is the easiest.
1. Open up the Bookmarks Organizer by going to the Bookmarks Menu, and click the Organize Bookmarks option.
2. Click the Organize Menu and choose the New Bookmark option:
3. Now you need to type in whatever name you would like for the Smart Bookmark. In the location field, however, is where you will insert the specialized “URL” which we’ll cover in the next section. This screenshot shows an example location that will return the top 10 bookmarks you visit the most:
4. The Smart Bookmark that you just created should now be visible in the Bookmark Organizer, and you can place it wherever you would like. The content will dynamically change based on the criteria that you specified in the previous step.
Here are a few to get your creative juices flowing:
* 10 Most Visited Sites:
place:queryType=0&sort=8&maxResults=10
* 10 Most Recent Bookmarks:
place:queryType=1&sort=12&maxResults=10
* 15 Most Visited Bookmarks:
place:queryType=1&sort=8&maxResults=15
来源看看这里：
http://forums.mozillazine.org/viewtopic ... 77#3260477
还有这里：
http://cybernetnews.com/2008/05/07/cybe ... firefox-3/
