Web browsers have their own system for rendering text and therefore color emoji. Firefox currently uses a version of EmojiOne but is switching to the Twitter emoji set. See https://bugzilla.mozilla.org/1358240
Honestly, the bug report you filed is too broad and in some cases is already duplicated by existing bugs.
Ubuntu 18.04 LTS installs the Google emoji font by default and that page does actually display correctly for me with Firefox. Web pages can specify a particular color emoji font though. Therefore, you will see different emoji sets on different web pages and that's not really a bug.
Web browsers have their own system for rendering text and therefore color emoji. Firefox currently uses a version of EmojiOne but is switching to the Twitter emoji set. See https:/ /bugzilla. mozilla. org/1358240
Honestly, the bug report you filed is too broad and in some cases is already duplicated by existing bugs.
For reference, you might find this page interesting (it's a large page): /unicode. org/emoji/ charts/ full-emoji- list.html
https:/
Ubuntu 18.04 LTS installs the Google emoji font by default and that page does actually display correctly for me with Firefox. Web pages can specify a particular color emoji font though. Therefore, you will see different emoji sets on different web pages and that's not really a bug.