v.0.2.1.1 (2017-01-21)

x Correctly update window title and style, if toggled private state of selected non-remote tab (restored non-remote private tab) in Firefox 51+ (#237, #239).
x Don't save closed private tabs in undo close history after extension disabling (extensions.privateTab.rememberOwnerTab = true).
x Correctly toggle private state of already opened tabs in Firefox 51+: now used more robust way to wait for asynchronous tab duplication (#237).
x Correctly make tabs non-private after extension disabling in Firefox 51+.
x Fixed: fail to startup on new profile (ReferenceError: _log is not defined) (#240).