ah; thanks for the explanation!

I appreciate the tip. It was alienating at first but after some fiddling it seems like a good option. My findings–

Pros

• It’s able to save a page as a single file which can be opened in both Firefox and Chromium browsers (rare!)
• It’s able to faithfully save a Github issue page that correctly renders when re-opened. (All other tools fail on a GH issue)
• The URL is embedded on the 3rd line of the file (rare… no other tool does this)

Cons

• No control over where it saves the file
• Forced GUI, no commandline (though I’m not sure if it can be hacked to run automatically in a headless Firefox or something)
• No icon appears in the plugin tray. And cannot be added using the Firefox custom toolbar tool.
• Default keystroke is control-shift-y (which clashes with the stock keystroke for reaching about:downloads)
• There is no menu item for it

I was only able to get it to work by re-assigning a custom keystroke which I will forget and have to visit the addon manager to recall.