The background color is now defined on .tooltip.tooltip-brand.
Update (2017-09-09): emoji (and some other) tooltips now use .tooltip-black instead of .tooltip-brand in Canary.
.tooltip-brand exists still exists on Canary, but .tooltip-black does not exist yet on Stable, so keep the script as is until the change makes it into stable.
The background color is now defined on.tooltip.tooltip-brand
.Update (2017-09-09): emoji (and some other) tooltips now use
.tooltip-black
instead of.tooltip-brand
in Canary..tooltip-brand
exists still exists on Canary, but.tooltip-black
does not exist yet on Stable, so keep the script as is until the change makes it into stable.