@ignaciogarces: update: use NightEye instead, it's an awesome extension!! (search in Chrome store). Finally, this is what I needed.

Like a esta extensión está bien hecha. La uso porque en Ubuntu no hay manera sencilla de insertar emojis >:v
Pero señores, recuerden que en Windows pueden usar [tecla windows] + [.] para insertar emojis

Does work but you have to enable the extension to "access to search results" or similar in the configuration, which is not indicated by the extension itself. For me, Linux Opera 74.0.3911.218, there are completely black zones at google search page results, which cannot be changed by the theme color settings. Very bad.