in the global configuration of Joomla, server tab, the option to compress pages is unchecked. Is that it?
the "JCE/global configuration/compression option" is disabled all compression too
In fact, the template has been optimized scripting option. I blocked it out. Still, the tabs do not work.
Interestingly, the copy of the page compus-net.pl/index.php/internet-w-twoim-domu-cennik
By the way scripts are not compressed. Was selected the option "join and minify" rather than compression.