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Font size on menus and tabs is not changing with devp setting

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Currently the font size on menus and tabs is very small. I have changed the setting in the following location and it changes the frame sizes / icons etc but not the font.

layout.css.devPixelsPerPx

Currently the font size on menus and tabs is very small. I have changed the setting in the following location and it changes the frame sizes / icons etc but not the font. layout.css.devPixelsPerPx

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Try the Firefox version from the official Mozilla server if you currently use a version from the repositories of your Linux distribution.

You can find the full version of the current Firefox release (74.0) in all languages and all operating systems here: