https://addons.mozilla.org/en-US/firefox/addon/operaceocipraha/ first author (perhaps there may be others)
https://addons.mozilla.org/en-US/firefox/addon/bernardmattashengo/ second author
Sorry, I have approved this duplicate, but finding copies of the same theme created by different authors, it is rather difficult usually it is spam… as well as in this case where the author is probably still the same and he advertises also in both profiles a Czechoslovak site