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Why do I no longer see an option to save to Zotero from the Firefox Open/Save dialog?
The Zotero Connector for Firefox uses Firefox's new extension WebExtension architecture, which no longer allows extensions to modify built-in Firefox dialogs. To save a PDF from the Zotero Connector, go to the Applications pane of the Firefox preferences and set PDFs to “Preview in Firefox”. When viewing a PDF, you can then click the Zotero Connector save button to save the PDF to Zotero, or click the download button in the PDF viewer toolbar to get the open/save dialog.
If you prefer not to preview PDFs in Firefox, you can also drag a PDF link from Firefox to Zotero to add it to your library.