04 Jul 2021: I have just found another problem, when I try to capture this webpage https://www.zhornsoftware.co.uk/bart/index.html the PNG file is 0 bytes long.

16 Feb 2021: There seems to be a problem. Saving long pages no longer seems to work correctly as the bottom part of the saved page has lots of missing rendering.

Original Review:
I've been using Firefox's internal screenshot capture, to capture full web pages to file... - this takes 4 mouse clicks, and doesn't allow modification of filename.
This add-on is just what I was looking for, with the ability to create your own filename format and a simple 1 click on the toolbar icon to save the web page.
There are issues if you include either the pages URL, or Title into the filename though, where quite often, the page doesn't save (Yellow dot next to Download Icon). I'm assuming this is either invalid filename characters or filename too long causing this problem. An option to truncate the filename to a maximum fixed length would be a start.