Alternatives to Theme Font size changer Firefox plugin?

[Tim]

Allegedly, on or about 06 February 2016, Sam Varshavchik sent:
> I am referring to Firefox UI elements. The Firefox menu bar, the URL
> bar, and the rest of the UI elements. The "Zoom Page" plugin, and
> other plugins of its kind, like Nosquint, only affect the web page
> contents, but not the rest of the Firefox UI. 

Do they not inherit the desktop fonts?

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Windows, it's enough to make a grown man cry!