Clicking on the extension icon often opens two tabs instead of one

[zawnk]

Using 1.0.3.4 of the extension. When I click the extension icon in the toolbar, generally two tabs are opened instead of one. Sometimes it's only a single tab and not two, but I can't reproduce the behavior. Generally 1 or 2 in 10 clicks opens a single tab, the rest is always 2 tabs.

PS: not entirely related, but the unread articles badge on the icon also goes away as soon as I click the icon. Even if I don't read any articles. After the next check, the number is back.