I can confirm that this bug is in Ubuntu Hardy Heron. I have firefox 3.0~b5+nobinonly-0ubuntu2. (the Firefox version pre-installed in Ubuntu.)
The bug appear only if the tab is being closed, not when you leave the page.
I can confirm that this bug is in Ubuntu Hardy Heron. nobinonly- 0ubuntu2. (the Firefox version pre-installed in Ubuntu.)
I have firefox 3.0~b5+
The bug appear only if the tab is being closed, not when you leave the page.