[okasaki]

You can't read minds, that's why I posted screenshots.

Surely you can see the difference between the font sizes for the ublock origin popup, and the enormous fonts on the settings page.

It's totally broken?

[yoasif_]

That looks expected to me. The zoom setting controls web page zoom.

[okasaki]

I give up.

[yoasif_]

Amusing response.

In any case, I checked out Chromium, and the equivalent setting is labeled "Page zoom" and affects extension popovers as well. As far as I know, extension popovers are not web pages, so your expectation (and Chromium's behavior) seem to be a bug - either in the settings UI, or in the way the zoom setting affects extension popovers.