I really appreciate the effort you do with keep this wonderful kind of addon updated, but (there is always a "but")
Sorry for give you 3 stars, I change it if you can resolve the problem or explain me why can not to do, I'm explain:
----------------
+SOME PAGES CAN'T SAVE SOME IMAGES
OS: Windows 10 Pro 1709 16299.309
Firefox: 59.0.1
Save Page WE: 9.3
Save Page WE Options > Saved Items: All checked
Webpage I want to save: http://www.wowhead.com/guide=3799/17-garrison-followers-under-2-hours-17-alliance-14-horde (Web about game WoW)
Using: Save Standard Items
Problem: All (or the important) images hosted on another server are not saved (other server: wow.zamimg.com)
This addons when finished download files report me that can't save about 8 images more or less.

I read "almost" every review and can't saw response from Developer about this problem (some users report this), but I detail all to have exact the test enviroment.
-------
Thanks to developer for assist me with a solution, the problem was that I have very slow connection, and max timeout of 60s was to low, in the next version will increasy it.
Change my review to 5 star, you deserve it!!!