The number of reviews sorting option shows up in the normal sorting options dropdown which is nice. Sorting worked for me after selecting a category

Was initially put off by the few recent reviews that say it doesn't work, but I can confirm it certainly does at the time of my review! Just make sure you select a category on the left side first.

This addon still works as long as you're searching in a category. If you search "iphone charger" but don't select the "Cell Phone Chargers & Power Adapters" department on the left side, it's not going to work.

I believe this addon has finally fully died. A month or so ago I was struggling to get it to activate. Now it's no longer functional on any subcategory I define. It's a shame. I salute you for the proper products you've helped me find with this. Based on it's last update date, I doubt it'll have a future. Good work either way.

Works just fine as long as you've read the instructions:

"You will need to select department/category on the left side to get the sorting to work correctly."

I don't really see this as an issue, Amazon typically automatically selects relevant categories during a search anyway.

works well, thanks!

This is working again! Thanks for fixing it. It once again works (on 1/15/2020 in FireFox 72) just as before.

After a search, you MUST select a department from the lefthand pane, or it won't work. Do that, though, and then you will have an additional option under the Sort dropdown listed as "Number of Reviews."