Aren't the VECTOR OR CROSS PRODUCT or N-ARY TIMES OPERATOR variants more widely available than MULTIPLICATION X, which is currently used to style the popup's icon overlays?

#extraTools > span.on > span:last-of-type:after {
  content: '\2715';
}

using

uBlock Origin 1.13.8
Chromium Version 59.0.3071.115 (Developer Build) (64-bit)
Linux arch 4.11.9-1-ARCH #1 SMP PREEMPT Wed Jul 5 18:23:08 CEST 2017 x86_64 GNU/Linux

...with the core fonts from Microsoft available for Chromium:

Andale Mono, Arial, Arial Black, Comic Sans MS, Courier, Courier New, Georgia, Helvetica, Impact, Times, Times New Roman, Trebuchet MS, Verdana, Wingdings 2, Wingdings 3 (via javascript)

While I do not see U+2715 (✕),
both U+2A2F (⨯) and U+2A09 (⨉) are available in all of the fonts Chromium presents to me.

I'm aware that due to its sandbox, Chromium does not fully integrate with fontconfig/GTK/Pango/X/etc. If there's a way for me to replace that symbol with a complementary font, please let me know.