CSS stlying is not property for disabled select item in firefox

[yaoterry]

firefix does not support to set the opacity for select item, https://github.com/carbon-design-system/carbon/blob/master/packages/components/src/components/select/_select.scss#L164

it's not a grey out styling for the disabled select item in firefox.

https://stackoverflow.com/questions/58437806/why-wont-firefox-grey-out-my-disabled-select-options

[emyarod]

thanks for reporting! this seems to affect all browsers, and the component should no longer modify opacity for the disabled state

[nictownsend]

https://react.carbondesignsystem.com/?path=/story/components-select--default - If I view this in Firefox Mac - it is still not working. The CSS color overrides set on bx--select-optgroup and bx--select-option are stopping Firefox from rendering the default disabled value.

[nictownsend]

Or conversely, Chrome is ignoring the user overrides and applying the user agent