It's not hard. Firefox under Unix has an interesting property. When you select text, you end up with the following targets for an X Window select operation:

It's not hard. Firefox under Unix has an interesting property. When you select text, you end up with the following targets for an X Window select operation: TIMESTAMP TARGETS MULTIPLE text/html text/_moz_htmlcontext text/_moz_htmlinfo UTF8_STRING COMPOUND_TEXT TEXT STRING text/x-moz-url-priv With this, I was able to add an extension to my editor to obtain the URL, pull the page, pull the title and generate an HTML BLOCKQUOTE with proper CITE attribute with the highlighted text included.