Thank you, Manuel! I registered a Mozilla account, after decades, just to be able to tell you that. Longer story:

As an Android Firefox (Fennec) user I grew increasingly frustrated and jealous of Chrome users who could so easily use the built-in Android long scroll screenshot capture feature that "just worked". Apparently Mozilla has classified this bug/feature as essentially "won't fix". Foolish - the feature is right there in Android now, but it just doesn't work in Firefox. I wanted to share some recipe pages with photos, and often the Print function in those sites strips the photo right out. Without a Google account (by choice) and an allergy to ads, the only thing I found was Stitch on F-Droid. It's fine, but has no scroll capture at all. Everything is manual and quite fidgety to accomplish what native Android provides in a tap.

Finally, I almost accidentally found your plugin. I added it to my Fennec and boom, a full page long screen capture, easily and within 2 seconds. It's like, perfect. I think your modest ("very simple") description undersells the value here, especially since Mozilla is so lacking and there are so few alternatives.

I've used it exactly once so far, and was impressed enough to register and peck this out on my phone. Well done. Thanks!

As Firefox currently doesn't support scroll/full page screenshot on Android, this extension is really useful. It simply just works.

To me, the only Screenshot Addon that really works (only tested on Firefox Desktop Version!).
It does what you hope for:
1 continues, big picture - in a small fileformat - without external servers - advertisements - or a heavy addon with several megabytes!
Sleek - working - FOSS - I love it!
Thank you Manuel!

still the best, simplest and versatile screen shot saver, many thanks to M-Reimer

This add-on work incredibly well on Firefox for Android!
A must-have add-on before FFfA has its built-in screenshot feature like the desktop version.

Mozilla Firefox 135.0b1 — OK.

This add-on is perfect. Although Firefox already has a screenshot feature, this add-on is very straightforward and offers various but simple options. I have it set to take screenshots in JPG format at 90% quality, and every capture comes out with excellent image quality and without much file size. Yesterday, I also discovered an option that lets you add the date, hour, minutes, and seconds to the screenshots exactly how you want! Thank you! :D

Work so good (Firefox mobile).

It's a add-on that does its job.

So helpful for firefox android! Please check it for security as well, Firefox team.

Es exactamente lo que estaba buscando. Funciona muy bien ya que guarda el sitio web tal cual como se en el navegador. Cuando hay partes de un sitio web que contiene un video, la captura puede tomar cualquier frame de éste, pero eso es un detalle. Muy buena la extensión.

So far, so good. I don't know if it has a shorter way to capture the screen, but you can choose from full, viewport and selection in PNG or jpeg. And the best feature is it names the capture! So it saves me from putting each name. Yeah!!!!