Rated 5 out of 5 stars

Firstly I appreciate that theres compatability issues from FF48 but at least until 51 it worked perfectly for years and is a wonderful highly recommended add-on, however whilst it still "works" in FF52 Ive experienced a few issues, especially saving across multiple tabs.
It errors with "CreateArrrErr. this.imgArr[i] is undefined" in sioverlay.js Line 345.
It DOES still save the images, but duplicates the 1st one and only renames the 1st one. Seems ok on single tabs and multiple images on a single tab so suggests that the file rename process is kaput. Also doesnt close the tabs any more.
(Update)
New version(1.24) seems a bit better but still showing errors now on line 667 of sioverlay.js when saving off multiple tabs. works ok if just single tabs. Occasionally also leaves tabs open. Keep plugging away as this is an excellent useful addon.
(Update)
1.2.5 fixes issues - Thank you...Now worried re Firefox 57!!

This review is for a previous version of the add-on (1.2.2).