User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0 Build ID: 20150826023504 Steps to reproduce: Open a Firefox browser window with a number of "pinned tabs" - the "source" Create a second virtual desktop either drag 'n drop the existing Firefox window to the new desktop or open another Firefox session on the new desktop Actual results: If the "pinned tab" window is dragged, the tabs remain pinned if a new browser window is opened on whichever desktop is sans Firefox NO "pinned tabs" are presented I haven't checked the effect if tabs are subsequently pinned to a new Firefox browser window with no pre-existing "pinned tabs" - after it is opened, nor the effect of "pinning" new tabs to the "source" browser window on whichever desktop it resides. Expected results: Unless it has been specifically designed not to open "pinned tabs" in a second or subsequent browser window then I would expect the "pinned tabs" to be made available. For the record, Bookmarks are presented in the normal manner with the subsequent browser session(s)
I guess virtual desktop is a native feature of Win 10 that I can't test with Win 7.
Pinned tabs in Firefox are per-window. They are not shared between windows in any way, no matter how you organize your desktop (virtual or otherwise).