It is greyed out in the jigsaw puzzle menu and does not appear on right click context menu, so does not appear to work.

Seriously? This supports like 1% of features of original Save Image in Folder ... where are "file-prefix" and "file-suffix", where is the possibility to use domain, date, where are the options what to do on duplicate filename, where is the logging - oh wait, I've added that myself, was easier before all extension needed to be signed ...

https://github.com/gyng/save-in/ looks more promising.

I'd give a zero if I could. It doesn't create or save anything.

Didn't work at all.