Kudos for the developer of this add-on. I've used this add-on for years now.
I really like it....

Good idea in general but it seems to have problems with pictures, just an example

https://www.rotan2.pt/

Only the big picture at the top is visible after saving the page (and the text columns are changing from right to left and back again after the positions where the pictures are at the original page), no other pctures are shown, I checked ticking and unticking the picture options "Saving delayed pctures..." (not sure about "delayed", here in German "zurückgestellte Bilder") but this does not make any difference

UnMHT on Firefox 56 saves the page with all the pictures and I see it exactly as on my screen before saving it including the text columns at the right positions, too. (page saved with SingleFile is about 67 mb without pictures, page saved with UnMHT is about 44 mb and has all the pictures)

Edit: It was not meant as a bug report.

Website see above saved with SavePage WE (never used so far) is much smaller than the one saved with SingleFile but otherwise exactly looks the same that is without the pictures etc. No idea why, not comfortable of course, seems that the mht format was the much better option for me at least

Excelente! Com várias funções úteis!

Works well, I wish there was an additional setting where you could choose where the file goes automatically, without changing the download location in Firefox, as I prefer all my saved pages in a different location than all my other downloads go to. (I currently have to move all the saved pages from "~/Downloads" to another folder.)

Great! The file saved is very small, and the function is powerful, some pages using the browser's saving function to save will load as blank, but using SingleFile is right.
非常好！保存的页面比浏览器的小多了，功能强大，有的页面用浏览器保存打开是空白，用SingleFile保存打开就可以查看。

works fine.

Absolute genius for making this. Easy to save and share pages with others.

Awesome extension, makes saving information very easy.

Best page saver extension ever!

This does what it says.
Thanks for developing such a great extension.

Very impressive, wow!!!!

Easy and does exactly what it needs to! Thank you @gildas!

Saves even complex pages!

Blow me, it works! Why doesn't the built-in Firefox 'Save Page As...' work as well as this add-on? It used to work, but for some reason, it just will not download any html pages these days? I like the way it's all-in-one solution, no need for a separate directory to store files in. It's not clear where the file is saved to, or how to define the download directory. I've since found out that this can be done, by ticking the 'Save as' box in settings - so problem solved! A great Add-on, keep up the good work.