You know that’s not the Tea code, but the downloader, right?

Where do you see it working? I see the result:

There were no results matching the query.

The extension mentioned in the post is supposed to:

return the relevant quote and inference for the user, along with links to article and quality signals

I don’t see any relevant quotes, or links to articles, or quality signals.

I tried with your comment: https://en.wikipedia.org/wiki/Special:Search?go=Go&ns0=1&search=I+can+currently+right-click+and+then+click+"Search+on+Wikipedia"+in+the+context+menu.++I+believe+this+works+in+both+FF+and+chromium+browsers.

Why doesn’t this work? If your complaint were valid, this should work.