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Just discovered that there's a bug in Firefox's 8bit bmp colour handling (renders the wrong palette values). It turns out it's 9 years old. The net effect (for me) is using a chroma-like key (magenta = transparent) doesn't work in FF. Because magenta isn't magenta, it's FF01FB.
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Oh wow. So more to this, again, think it's limited to BMPs with palette index, but the entire range of FFxxFF is borked. No matter what colours I put in, R is correct, G and B are shifted.
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PNG8 are not affected. The palette index looks to be read correctly.