Click-and-drag bookmarking moves tab to new window instead
Steps to reproduce
- Click a tab's list item in the sidebar
- Drag it into a bookmark folder.
Expected behavior
The tab should be saved as a bookmark in the target folder.
Instead, the tab is moved into a new window and the bookmark interaction is ignored.
Platform
This has happened on Windows 7 and Ubuntu. My current version is Firefox 70 stable. This behaviour has been occurring since installation.