Short description

I'm unable to drag a tab from the TST to anywhere else in the browser. A black "not allowed" kind of sign blocks any interaction with the browser except inside the TST area.
Until recently, I could drag and drop a tab from TST to my bookmarks toolbar. That's not working anymore.

Steps to reproduce

1. Start Firefox with clean profile.
2. Install TST.
3. Open website.
4. Try dragging the tab onto the bookmark toolbar.
5. A symbol shows and blocks dropping the tab on the bookmarks toolbar.

Expected result

Dragging the tab to the toolbar and dropping it there should create a bookmark.

Actual result

Unable to drop the tab over over the bookmark toolbar.

Environment

• Platform (OS): Windows 7
• Version of Firefox: 62.0
• Version (or revision) of Tree Style Tab: 2.5.4