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When Firefox goes to a new webpage I don't want it at 100% zoom but at a different percentage that I specify, and I want it to always use this zoom for all pages that it goes to. How can I do that?

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up vote 11 down vote accepted

The Firefox addon NoSquint allows you to adjust the text-only and full-page (both text and images) zoom levels as well as color settings both globally (for all sites) and per site.

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This is useful. – Phenom Dec 30 '09 at 16:25
    
It's not only useful, it's the best add-on I've ever used. My tired old eyes are thankful for the SuperUser for told me about it. – Patriot Dec 30 '09 at 16:30

This is user configurable from Firefox, without the need for any add-ons.

  1. In the address line, type: about:config

  2. Scroll down or search for the preference name: browser.zoom.siteSpecific

  3. Double-click to change the value to false

Now your zoom settings will carry over from site to site.

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1  
Does changing browser.zoom.siteSpecific take effect immediately or is a restart of Firefox necessary? Ref – Peter Mortensen Feb 15 '12 at 9:55
    
This does not work with Firefox 29 – Steven Penny May 4 '14 at 7:59
1  
this works in v32: type about:config in address bar, search for layout.css.devPixelsPerPx, change value from -1.0 (auto equals win dpi) to for example 1.5 (equals 150%) – user372675 Sep 26 '14 at 18:17
    
devPixelsPerPx scale the whole UI, not only web content. But it's probably the closest addon-less workaround. – Borek Jan 4 at 15:44

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