Is there any way to clear the list of previously used locations in the "Add to Bookmarks" applet? Mine have been "frozen" for 4-5 YEARS. In the attached screencap, the entire bottom half of the list is useless - I haven't used "Food Idiots", "Downloads", "MP3" and "Stuff" folders in years. It's annoying because I use bookmarks almost exclusively for saving sessions (Select All Tabs > Bookmark Tabs), but every time I have to manually select the "Sessions" folder. In fact, when I took the attached screencap I'd just finished saving 11 windows to the Sessions folder... and had to manually select them every time! Thanks!

await PlacesUtils.metadata.set(PlacesUIUtils.LAST_USED_FOLDERS_META_KEY,[]);