MarkTree per Erhannis

For organizing and preserving tabs indefinitely across sessions. Each new tab gets a mark, which you can organize into trees. Ctrl-Shift-L to create a new mark in same folder as the current tab, Ctrl-Y to delete a tab and its mark. Ctrl or Shift click on items to multiselect, then drag into folders or press the delete key. Permits backup and restore. Code generated in close cooperation with ChatGPT.