Type "chrome://extensions/" into your browser address bar. Find "savefrom.net helper" in a list and delete it.

Unfortunately, it's not a solution of this problem. It's better to use
tempermonky and user.js.

We asked developers of tempermonkey to make a support of functions which allow to give the name of a file. We hope they will consider positively our request

Hello, unfortunately Google started to turn off extensions. That's why we recommend to install a user script.
How to do it:
1) install tampermonkey - https://chrome.google.com/webstore/detail/dhdgffkkebhmkfjojejmpbldmpobfkfo
2) install user script. - https://sf-addon.com/helper/chrome/helper.user.js?ts=1402553853