Yes, you can rename that folder. First try right-clicking it where you see it and using Properties.

If that doesn't work, you can do it in the Library dialog, which you can open using either:

• Ctrl+Shift+b
• "Show All Bookmarks"

Initially, you'll need to click into the Bookmarks Menu or Bookmarks Toolbar to find the folder you want to rename. Select it and use the form at the bottom of the right pane to edit the Name. Tab out of the Name field to save your change.

Success?

Such an 'import from' folder may have special annotations, so to avoid any issues maybe it is best to use cut (copy) and paste to move the bookmarks in that folder to another bookmarks folder.