Simply the best addon for saving pages. The Author DW-dev is awesome, a lot of his addons are useful and cool, thanks to him!
The only additional desire/request - add feature to ignore requests that are blocked by uMatrix, because otherwise there is a privacy problem - the cross-domains requests are block all the time, but when you save page - you make those dangerous request to spying servers of social networks and etc.
So, the addon is awesome, I'm recommending it! But please create an issue in your tracker - to involve somehow uMatrix addon and allow it to block request when saving pages using Save Page WE.