While it does seem to work well, I was unable to get the icon to appear on any of my toolbars on separate computers. And with no hotkey, if you are screen-shooting a few tabs at a time, it's not any more convenient than clicking through the Firefox screenshot option. The only advantage seems to be the "full page" feature which most people would probably use the fewest amount of times.
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Addendum: I was planning on changing this review today, as I reviewed other add-ons I also started using yesterday. Then I saw the developer response, and thought I should hurry before they get any more irate.

I did know about the "pin to toolbar" option for the add-ons. However, when I first tried it, the icon still did not show up on the toolbar. It wasn't until later that I noticed that others weren't showing up either after trying to pin them. So, I removed those add-ons and reinstalled them. Then it worked. This was a brand new profile, so maybe some bug or something that came with an update? I don't know.

As for the shortcut key, I also noticed that the keys for this add-on was in conflict with another key, which I thought was the problem. But after removing the conflict - and then reinstalling the add-on - it still doesn't work. Another bug? I don't know. In any case, I raised my rating to four stars since, as discovered, this was obviously issues with Firefox itself and not just the add-on.

Extensão boa para Firefox de Desktop e que pode ser instalada no Firefox para Android. Á de melhorar a interface para se adequar a resolução de tela do navegador na versão Android e corrigir bugs das funções de captura parcial e completa do site quando se marca a opção de 'mostrar a notificação de conclusão da captura' fazendo com que a captura não funcione.

Atualização 11/03/2022
Muito obrigado por ver meu comentário 👍. O visual da resolução da extensão ficou muito boa, além das funções de captura estarem funcionando bem no Firefox para Android. Tomara que logo esta extensão entre no catálogo da AMO para Android. E que você desenvolvedor, continue assim se empenhando sempre, saúde e paz para todos nós. 😄✌️

Complimenti, un programma intuitivo ed efficace; se ci fosse lo Scrolling Screenshot sarebbe perfetto.

非常好，希望移动端也可以手动截图

I just installed and have only used once to copy a full page to clipboard - but it worked like a charm! No scrolling, just click the icon, choose what type of grab you want, presto, done. If it works this well once I've used it more and with different types of grabs, I'll certainly come back and give it five stars and a rave review.

Thank you for creating this!

素晴らしい！！！　私の求めていたものはこれだ！！！　
[ワンクリック] → [既定のソフトで開く]　or [保存] の簡単操作！！
こういう説明不要。　何も考えずに使える簡単なAddonがベスト！

ただ、問題点としては保存先が強制的にDownloadになること。
これはデスクトップのほうが有り難い人にとっては、都度変更しなければならない不便さがある。

--2017/12/15--
Firefoxの設定から既定の保存先をデスクトップに変更することでデスクトップが保存先として選べるようになりましたが、他のDownloadファイルも全てデスクトップに保存されるため、完璧とはいえません。
ただ、以前使用していた Perl Crescent Page Saver がScreen shotの保存先を任意に設定できたので便利でした。そのアドオンは、現バージョンのFirefoxには未対応で、同作者の後継アドオンは以前より使いにくくなったので、こちらを使用しています。