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I see the effect you’re talking about. That’s unrelated to Firelight, which is just for opening the images larger.
Something is adding blur behind your captions. I see those are just image blocks. Unless I’ve missed something, I don’t think that styling is coming from the default image block. So something else – maybe your theme or a plugin – is adding extra styles.
Even without knowing what’s adding it, you can remove by overriding the CSS that’s adding the blur:
.wp-block-gallery.has-nested-images figure.wp-block-image:has(figcaption):before {
display: none;
}
Given this isn’t Firelight related (and given the CSS above should resolve it in any case), I’m going to go ahead and mark this resolved. But please feel free to ask other questions on the plugin if you have them.