After v1.22.66 update got installed, downloads of random web pages fail to get past 'Step 1/3', even after 7 minutes waiting; said failures happened at wiki pages at github, or random news articles. 🙁
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When Moz canceled Addons in Firefox, oh it was a grievous act, especially because I lost SingleFile use. After years of holding a faint hope that SingleFile would come back ... I found it again! For Android. Oh, joyful day! Truly.

I fiddled with the settings to my heart's content, and SingleFile works like a champ in my peruser. 'Save as PDF' of the peruser often clips-off wide text lines; SingleFile gives me a clean copy of a webpage. Something I disliked is that ISO date/time vars only emit Zulu time; I want the ISO format for local date/time. But I recommend SingleFile with a high-five.

Side annoyance: Android won't open with a peruser an HTML file living in mobile storage, *sigh*. So I use an HTML editor that has a 'display html' function to view my saved web pages.

This extension doesn't work as expected:

I'd like to use it to archive my article listings on eBay. If I save such a page using SingleFile and then open the saved page, the image magnifier and most other interactive elements do not work. This problem appears in every browser I have tested (Firefox, Chrome, Edge, all up to date at the time of writing). I already have unblocked every resource type in the "Network - blocked resources" section of the extension's options.

Further investigation (looking at the console in Firefox) showed that Firefox wanted to load a bunch of scripts and other resources from the eBay website when opening the saved page. This failed due to the Content-Security-Policy, which is understandable. This means that SingleFile does not download scripts and other resources as expected, or does not save them locally, or does not change the URLs of such resources in the saved page so that the resources' local versions are used when opening the saved file.

Given that, the extension is not usable for me. At least, it doesn't provide anything that "File -> Save Page As ..." does not provide as well (I don't care whether or not a saved page is contained in a single file, and every browser except Firefox can save a page to a single file anyway).

could be 4 or even 5 stars but:

1. i'd suggest adding an option to download to a folder other than the location set within firefox and

2. not sure if it's a recent FF update or the add-on itself but it's been failing hard lately. when i set it to close tabs after saving (convenient and seems to speed up the process a bit) it "pretends" to save them but they're nowhere to be found. if i select all and chose "dl selected" or "dl all" with "close after" unselected it usually saves most of the tabs but it's gotten insanely slooooooooooooooooow. like 56k slow.

fixing one or both of these would make it a better add-on and get 5 stars easily.

I chose to save all links on a webpage (more than 100 to individual images) and it opened more than 100 tabs. [answering the reply below] But opening more than 100 tabs freezes Firefox, is this really the way it should work?