Hasn't been working for a while, so I'm changing my rating.

It’s really sad to see that the author doesn’t care about their own creation. For two months, it hasn’t been working as it should, and there’s no update to fix it. Now this add-on is useless.

newest update removes BetterViewer from being the Default viewer and simply adds it as an option at the bottom of the menu.

...this entirely defeats the point of BetterViewer, as I installed it specifically to REPLACE the default image viewer, not to have an option.

Also I created an account just to write this review, BetterViewer was almost perfect before, now it's pretty much useless.