The icons displayed in the windows switcher for Firefox and Thunderbird are changed to the default (white window with blue title bar) icon as soon as a new tab is opened in these apps.
OS: Arch Linux DE: Xfce Version: xpra v2.0.2-r15657
Duplicate of #1144.
Please add information there as per ticket:1144#comment:5
See ticket:1144#comment:9, r15826 may fix this (I cannot confirm, my DE doesn't misbehave)
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1514