User-Agent:       Opera/9.25 (X11; Linux i686; U; de)
Build Identifier: 

I think not only the active but also tabs in background should be closable via middle click.

Reproducible: Always

Steps to Reproduce:
1. Open a second tab
2. Do a middle click on the first tab

Actual Results:  
Nothing happens.

Expected Results:  
The tab which was clicked on should be closed.