This is exactly not a bug, because I don't know how to produce this problem...

I have tab close buttons on:
I added the following preference option and gave the value '1'. : 'browser.tabs.closeButtons'

And I use many tabs:10 ~ 20.

But at times, if I close a tab with double-clicking it, it closes not only that tab, but also one other that is near.
And I don't think this is my bad movement of mouse, so clicking the 'closebutton' icon(X) in other tab. Because if this happens one time, I can produce this problem again again... But I don't know how to make this problem first. this is just luck.

So do other people have this same problem??