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Make Page scrolling just half of the page

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I'm used to navigate with my keyboard, but whenever I press PgUp and PgDn it scrolls a full page, making it difficult to follow reading, so I was wondering if in about:config it was any setting to make it scroll only half of the screen.

Thanks

I'm used to navigate with my keyboard, but whenever I press PgUp and PgDn it scrolls a full page, making it difficult to follow reading, so I was wondering if in about:config it was any setting to make it scroll only half of the screen. Thanks

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I don't think there is a built-in setting for this, but perhaps someone knows of an add-on solution.

Searching around a bit:

This discussion suggests some workarounds, not quite as handy as fixing the built-in keys: Scroll control? - firefox | Ask MetaFilter.

I also noticed some discussion of a script solution, but it seems incomplete: keyboard - Scroll down half the screen size in Firefox - Super User.