Works so far... Ohodnoceno 5 z 5 hvězdiček
I was using Minimize to Tray Revived (MinTrayR), but it kept disabling the close button on Thunderbird (usually after waking up from hibernate). This has the same functionality, but adds the ability to use a hotkey to minimize to tray. As long as this doesn't show the same bug, it will be a perfect replacement.
Update after 3 days...
It's still working perfectly through 3 or 4 hibernate and wakeup cycles and another dozen or so sleep cycles. It's perfect.