See: https://bugzilla.mozilla.org/show_bug.cgi?id=392193#c7 this is original Ondrej's patch: https://bugzilla.mozilla.org/attachment.cgi?id=310768 this is version of the patch maybe applicable to 1.9.1 (no idl changes, mostly wip, won't work) https://bugzilla.mozilla.org/attachment.cgi?id=376133

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

this improved in the new import module, we can investigate improvements and file bugs on them, though we don't need this bug.