It was stated that the text is okay in "other programs," but not whether it's the same at other sites using the same browser. One would suspect that it would be "double sized" for all sites visited.

Browser settings should not affect any other programs.

Accidental activation of "Accessibility" functions would affect (nearly) all programs, so that can be ruled out.

Since the only buttons on the browser are "File Edit Window SignOff Help," it might be worthwhile to click each one of them and see what is offered as "next steps." My guess would be that "Window" should give you some display options, since there's no Win-standard button for it. And there is always "RTFM" - via Help; (of course you need to look in the browser's help - not Windows help.)

John