Prestashop will install modules from another user. How to fix?

Question

Apache HTTP Server

Hello. On reg.ru vpska for a long time, on ubuntu12.04-x86. I installed prestashop, upload the module, install it, and it has a different user when copying files by the installer itself, which causes errors and denial of access to new files. Of course, I can find all the files that are created when installing the plugin and assign them an ftp user, but there are a lot of plugins and I am developing sites and I will often have to install / delete various ones, and even write and test my own. Can you tell me how to solve this problem? In filezilla, it is not clear which user is being created, they are numbers, but I understand that this is www-data from Apache.
https://yadi.sk/i/YzjBnjoCvg8L4 Here is the screen. 501 502 user is the required ftp, which was loaded by the engine itself, and 33 33 it looks like www-data ..