This one: GitHub - sqmk/pecl-jsmin: PHP PECL extension for JavaScript minification
…
Probally not supported any more or at least follow the instructions there …
If it doesn’t work good luck…
This is not the answer, the question is: Where Hestia stores extensions, cause the instructions in the description are for a generic approach (and aren’t working).
All PHP default …
There is nothing custom about it.