Include URLs of paper articles in references – When this option is disabled, Zotero includes URLs when citing journal, magazine, and newspaper articles only if the article does not have a page range specified.

Default Output Format – Sets the style to be used when copying a reference to the clipboard using the Quick Copy shortcut keys, or drag-and-drop.

Copy as HTML – Changes the Quick Copy output from plain text to HTML.

Site-Specific Settings – Overrides the default Quick Copy style when a particular web site domain is open in the Firefox browser. This makes the use of different styles in different contexts quick and easy.

See Zotero and Wikipedia for more information.