abrowser question

I have an issue with abrowser. When I hover the cursor above the abrowser entry in the taskbar, a preview pops up showing a random abrowser tab. The problem is, this tab may have been closed a couple of days ago! I would like to disable this preview feature. It is a potential privacy risk and an annoyance.

Firefox is the only app on Trisquel that creates such a popup. I can find no way to disable this feature in Linux, though there is much info for Firefox on Windows.

Thanks!