Can you clarify what you mean by "text-only zoom"? Can you also mention how you are zooming, e.g. via Ctrl+Plus, View -> Zoom menu item, hamburger menu, etc.? Do you have any addons installed (particularly addons related to zooming)?
Bug 1590445 Comment 2 Edit History
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Can you clarify what you mean by "text-only zoom"? Can you also mention how you are zooming, e.g. via Ctrl+Plus, Ctrl+mousewheel, View -> Zoom menu item, hamburger menu, etc.? Do you have any addons installed (particularly addons related to zooming)?