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How do I get the CSS and source for the print version of a document?

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Many sites use a media query to provide different CSS for printed output.

For debugging and comparison purposes, it would be useful to retrieve the CSS and HTML that are producing the preview output I see in Firefox's internal print dialog. (This is especially challenging for sites that use JavaScript extensively to serve content.)

How can I accomplish this? (I'm using 89.0.2 (64-Bit) on Linux.)

Many sites use a media query to provide different CSS for printed output. For debugging and comparison purposes, it would be useful to retrieve the CSS and HTML that are producing the preview output I see in Firefox's internal print dialog. (This is especially challenging for sites that use JavaScript extensively to serve content.) How can I accomplish this? (I'm using 89.0.2 (64-Bit) on Linux.)
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