This screen capture works wells, fast, literally with one click, and each capture is detailed and clear. It often is able to copy the exact page better than other pdf tools and extensions out there. Not sure why all the bad reviews but they are not true.

You have to pay a subscription fee to be able to change the pdf file settings. You'll get a pdf file, but it will always be in landscape page set up unless you pay to change. Deceitful advertising. All these "Save to PDF" Firefox ad-ons do this. Total BS.

WORKING WELL

This is a very bad rip-off of another extension called PDF Mage. It clones all the interface and behavior, but produces much worse quality PDFs. Worthless.

Doesn't produce anything but a sale pitch for subscription.

It works like a charm. Yes, it adds an unobtrusive thin black tag at the bottom of each page with a link to their site, no big deal at all.
Edit Jan 2020: I noticed that it saves pages as Landscape only! There is no option to set it to Portrait. Taking off one star.

Adds some strange empty black page at the beginning of the saves PDFs, which is wide and makes the rest of the PDF file look small and not proportional.

This plugin adds a big tag in the middle of each "pdf" created (with of course a link to their site), to switch to the paid version. I think developers should tell this in the "about section" of this plugin.
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Ce plugin ajoute une grosse étiquette au milieu de chaque "pdf" créé (avec bien sûr un lien vers leur site), pour passer à la version payante. Je pense que les développeurs devraient le dire dans la description de ce plugin.