Hi, thanks for your review. Undo delete/remembering deleted items is one of the most-requested features, and has been in the works for quite some time. Fortunately, I'm happy to report that it's now available in Tab Stash 2.7.

Import and export has been available since Tab Stash 2.6--you can find it in the menu next to the search bar in the Tab Stash UI. A variety of formats are supported, including Markdown and OneTab.