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.
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.