Steps to reproduce:
* Install `fonts-noto-color-emoji-0~20180424-2`
* Open PureBrowser 52.8.0
* Visit https://en.wikipedia.org/wiki/List_of_Emojis
What should happen:
* Most emoji render in colour
* Missing emoji appear as "tofu"
What happens instead:
* some emoji render in color as expected
* some emoji render in black and white (rather than color)
* some emoji render in color, but are far too big
* missing emoji appear as tofu
{F64938}
Notes:
* Related link: https://unix.stackexchange.com/questions/444141 (suggestion there is that this issue may be related to fontconfig)
* This persists after running `fc-cache -f -v`
* If I copy and paste the text into Text Editor, the emoji appear as expected:
{F64941}