The menu bar at top of screen.
I can change the font size of everything except the menu bar (File Edit View, etc.) at the top. No one has instructions for this task. How do I do that?
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Evidently you are using a mobile phone. You need to ask below although someone may be able to answer your question here.
You can set layout.css.devPixelsPerPx to 1.0 (default is -1) on the about:config page. Adjust its value in 0.1 or 0.05 steps like 1.1 to enlarge or 0.9 to reduce until icons/text looks right. You may need values above 2.0 if you have a high resolution display but make sure not to use values too large or too small.
- modifying layout.css.devPixelsPerPx affects user interface and webpages (global zoom)
Firefox has a Zoom section in Settings to set the default zoom level for webpages.
- Settings -> General -> Language and Appearance -> Zoom
You can open the about:config page via the location/address bar. On the warning page, you can click "Accept the Risk and Continue"to open about:config.