I've made several tries on my W11 box with Firefox (default) closed. Each time, using either method, Windows opened Firefox with two tabs confirming no problems found.
Curiously, there was no way to tell which tab referred to which CSS Styles sheet. But as they were both NFF, it didn't matter.
When I tried using the latest version I have of the Sigil User Guide 2.3.0+, Windows correctly opened two tabs in Firefox. W3C reported NFF in one tab and 1 fault in the other tab. The W3C tabs didn't have any filename attached to their reports but the fault was listed as on URI 8 and detailed so I could locate it by inspection.
Shame they don't report the CSS style sheet filename.
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