- I started downloads of several files in Firefox.
- While downloading, there was no free space left on my hard disk.
- I got some error messages (with wording like "not enough free space" and "cancelled download").
- I deleted all newly downloaded files (the completed and the cancelled ones) manually.
Problem: In the download window two of these downloads are still listed and can't be removed.
As you can see on the screenshot, I can't clear the list by clicking the button in the bottom left corner (it's inactive).
Selecting "Pause" or "Cancel" in the context menu doesn't do anything.