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font size in menus especially bookmarks

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FireFox continues to provide no easy solution to the ever decreasing font size in menus and toolbars. This is an accessibility issue and FireFox fails. Yes, I can increase text font size of displayed webpages, but this doesn't address the more profound issue of font size in the browser itself (menu and toolbar text). This has been a known issue for years. The only solution offered is writing code, which is no solution at all.

FireFox continues to provide no easy solution to the ever decreasing font size in menus and toolbars. This is an accessibility issue and FireFox fails. Yes, I can increase text font size of displayed webpages, but this doesn't address the more profound issue of font size in the browser itself (menu and toolbar text). This has been a known issue for years. The only solution offered is writing code, which is no solution at all.

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You can look at this thread:

  • /questions/1384204 Since the last update, the Firefox screen does not fit my system setting(125%)

If setting browser.display.os-zoom-behavior = 0 doesn't work for you then you can create a new Number pref on the about:config page and set its value to 100. Paste ui.textScaleFactor in the search bar and select the Number radio button and click the '+' button to add the new Number pref, enter the value (100) and click the blue OK button to confirm.

  • about:config => ui.textScaleFactor = 100

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.


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 to compensate for the devPixelsPerPx changes.

  • 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.