Disallow usage of Tor Browser until it is determined that the version is not the most recent
It is currently possible to use TB before and while downloading update. It is a grave security risk in case of 1-days.
It is proposed to disallow navigation in the following cases: 1 update is available, containing vulnerabilities fixes, but not yet installed. In this case update downloading progress should be displayed and the list of vulnerabilities fixed in the update. 2 It is unknown whether update is available.
In all cases the message must contain some text explaining why it is important to wait until the update process is finished.