Great invention! And it gives the icon's translation in the browser language! Great! The only thing I'd like is to able to edit the translation.

If you look on this page :
https://en.wikipedia.org/wiki/Emoji
…using your extension with the options of displaying NO text and NO emoji, any emoji still visible for me is passing through.

But of course it depends on what you consider emoji and what you don't consider emoji. Anyway I think your extension would be more useful if any "character" that displays as (colored?) picture would be handled by it, thus likely at least any character coded by a code point in a 0x1f000-0x1fffff range, not only depending on any closed list provided by the Unicode Consortium.

I actually found your extension while looking for something able to completely hide all emojis, willing to solve the problem of someone else who feels "harassed" by the spreading of emojis. Focusing on this idea may also be good reason to use this extension.

About French translations, you will be probably able to find them on the following site:
http://hapax.qc.ca/
… and more precisely in the following file:
http://hapax.qc.ca/ListeDesNoms-7.0(2014-06-22).txt

Of course, other languages have to provide their own set.

Other suggestions by the way :
- The names given by Unicode Consortium are generally given in all uppercases. It would be probably more beautiful and comfortable to have the option to convert them in lowercases, or better in lowercases with at least first letter on uppercase or something even smarter.
- Some contextual menu items could be optionally added for being able to change the behaviour on the fly.

Gingko