@sadyphus strange, works as described on the addon page for me - you have to keep in mind that addons can not yet add their context menus to tabgroup headers, so you have to click on any tab inside of a group to unload it.
full or partial export as html or json => https://addons.mozilla.org/en-US/firefox/addon/bookmark-branch-porter/CSV has no inherent concept of a try like structure ... but i guess one could add an ID and parantID save the relation ... sounds a bit ob...
