@yullyp20 Opera doesn't own a translation service, so for something like that to be added Opera would need to make a commercial agreement to one of those services.
Also, they would need to see if the costs would be worth it.
I did it: I followed the steps from the link, option 2(https://www.reddit.com/r/operabrowser/wiki/opera/linux_libffmpeg_config/), but instead of creating a new folder as mentioned at the end of the tutorial, what I did was replace the one that Opera already had with the one I took from Vivaldi. I hope it helps someone else.
@jvariance yes, for the most part, extensions that aimed at affecting the contents of a website doesn't work on the "active" tab
already notice Bitwarden and Youtube Enhancer, there might be even more