Changelog for mozilla-flashblock-1.5.20-1.fc28.noarch.rpm :

* Thu Jan 07 2016 Chris Smart - 1.5.20-1- Update to version 1.5.20.- Use signed xpi from mozilla so it works with Firefox 43
* Wed Feb 04 2015 Matthew Weaver - 1.5.18-2- Add whitelist for youtube to workaround flashblock bug with html5
* Fri Dec 19 2014 Ian Firns - 1.5.18-1- Update to 1.5.18 release.
* Sun Jun 30 2013 Chris Smart - 1.5.17-1- Update to 1.5.17 release.
* Mon Jul 02 2012 Chris Smart - 1.5.16-1- Update to 1.5.16 release.
* Fri Mar 18 2011 Chris Smart - 1.5.14.2-1- Initial port.