UPDATE: For a new roundup as of June 2020, see: https://www.jeffersonscher.com/ext/pdf-converters.html
This is a little roundup showing some initial movement toward using the new API among the Firefox57-tagged extensions. I'm sure I'm missing things, but this took long enough already. ;-)
Uses the built-in saveAsPDF() function (Firefox 56+ on Windows and Linux):
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Page To PDF version 1.0.0
- Offers access to numerous page settings via toolbar button, with Spanish and Norsk/Dansk localizations
- Site: Not available
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Print to PDF version 0.1.0
- Offers access to PDF page settings (e.g., margins, scaling) through the Add-ons page
- Site: http://mybrowseraddon.com/print-to-pdf.html
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FoxyTab version 2.9
- Multifunctional extension adds numerous commands to the tab right-click context menu
- No feature to vary default page settings
- Support: https://discourse.mozilla.org/t/support-foxytab/11518
Uses an online service:
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PDF Mage version 1.1.1
- Sends the rendered page content to capture it as you see it (raises some privacy concerns)
- Site: http://www.pdfmage.org/
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Print Friendly & PDF version 2.2.0
- Includes feature to modify the appearance of the page before generating the PDF
- Site: https://www.printfriendly.com/
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Web to PDF version 1.3
- Converts based only on the page URL and not the rendered page content (may not look the same)
- Site: http://html2pdf.it/
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Convert WebPage To PDF version 1.0.5
- Converts based only on the page URL and not the rendered page content (may not look the same)
- Site: https://sidson-aidson-pdf-server.herokuapp.com/
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PDF Creator version 0.4.3
- Converts based only on the page URL and not the rendered page content (may not look the same)
- [ADWARE] Includes monetization feature: Extension Privacy Page
Not a direct PDF converter:
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PDF editor online version 1.0.3
- Adds a command to the right-click context menu for links to load the linked page into an online document editor from which you can export to PDF format
- Site: https://www.offidocs.com/
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PDF editor PDFOffice to edit and create PDF version 1.3.5
- Adds a command to the right-click context menu for links to load the linked page into an online PDF editor
- Site: https://www.redcoolmedia.net/index.php/web-online-productivity-apps/pdfoffice-pdf-editor-online-adobe
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Easy PDF Converter version 1.0
- [HIJACK?] Replaces the new tab page with a PDF conversion service website