Thunderbird 102.1.0 just updated itself from 102.0.3. Selected Release notes link from 'About ThunderBird' window. The page displays BUT you cannot navigate to 'security fixes' link on the page. [https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird102.1] The link is clicked but the window does not update .... as if the link points to some inaccessible location. (No error messages just no action at all !!!) The same 'About Thunderbird' page works in firefox 103.0. and you can navigate to the 'security fixes' page as per above link. Previous version of Thunderbird worked correctly !!!