Firefox isn't allowing preventing me from downloading Savefrom.net

Hi there, thank you ... I've used Savefrom for a long time, and no suddenly its not working. I've tried downloading this into Firefox again, but keep getting this error message via this URL:

https://download.sf-helper.com/mozilla/helper_last.html

Error messages:

'Firefox prevented this site from asking you to install software on your computer'.

So, I clicked 'allow', and got this error message, 'the add-on could not be downloaded because of a connection error.'

Install the extension from the Mozilla Firefox store: 

https://addons.mozilla.org/en-US/firefox/addon/savefromnet-helper/versions/

Oh awesome, thanks, its already working.  You're brilliant!!!!

Ок :)