Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1b5pre) Gecko/20090517 Shiretoko/3.5b5pre ID:20090517031745 If a user selects Bookmark all tabs from the bookmarks menu and has open a couple of tabs it takes a while until the ui is displayed. As more tabs are open as longer the delay is. Dietrich thought that probably temporarily bookmarks are created when doing this action.

Bug 451915 - move Firefox/Places bugs to Firefox/Bookmarks and History. Remove all bugspam from this move by filtering for the string "places-to-b-and-h". In Thunderbird 3.0b, you do that as follows: Tools | Message Filters Make sure the correct account is selected. Click "New" Conditions: Body contains places-to-b-and-h Change the action to "Delete Message". Select "Manually Run" from the dropdown at the top. Click OK. Select the filter in the list, make sure "Inbox" is selected at the bottom, and click "Run Now". This should delete all the bugspam. You can then delete the filter. Gerv

it's pretty much instant for me. Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0a1) Gecko/20110501 Firefox/6.0a1