Screengrab! 2.2 Rated 5 out of 5 stars
I tested it with Firefox 56.0 32-bit and Screengrab! works very well. Thanks Oleksandr and peace in your country.
Edit on Oct. 01:
I can't Save Complete Page / Frame on this site:
Later on Oct. 01:
The problem is NoScript 5.1.1. Thanks Oleksandr.