[yoasif_]

Not sure what you are frustrated with (can't read minds), but in my testing, the zoom setting you showed doesn't affect browser chrome, just web pages. Not sure why the rest of your chrome seems oversized, but you may be experiencing a bug. I'd report it.

[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.