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How can you permanently zoom in Firefox without using an add-on?

Does Firefox have a zoom option similar to Internet Explorer, Chrome & Opera's zoom to x% option?

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Notice: These settings may not work with version 29 or newer.

Open Firefox and type about:config into the address bar and search for "zoom".

In the search results, change two settings as below.

browser.zoom.siteSpecific false
zoom.minPercent 150

The value of zoom.minPercent must be an integer.

  • Emperically determined: Firefox must be restarted before it takes effect, at least for zoom.minPercent. Tested with Firefox 8.0.1 (Portable edition) – Peter Mortensen Feb 15 '12 at 9:40
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    This does not work with Firefox 29 – Steven Penny May 4 '14 at 7:58
  • I guess this is a bug in 29. I did the changes and restart the firefox. All sites started in %100. When I touch ctrl+scroll, page became %150 zoomed. I think, somehow, they broke zoom.minPercent behaviour option on startup. – Sencer H. May 5 '14 at 9:03
  • Version 47 and still this method doesn't work – D.Snap Aug 3 '16 at 8:50
  • Or one can simple set zoom.minPercent 150 and zoom.minPercent 150. – mk1024 Jul 5 at 21:02
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From https://superuser.com/a/1268867 :

The default zoom in Firefox can be reset to any value for all webpages without installing an extension.

  1. In the Firefox address bar type: about:config

  2. Search for this preference: layout.css.devPixelsPerPx

  3. Replace the default value of -1.0 with the new percentage zoom. For example, if you want to change the default zoom from the default value of 100% to 125%, then change the value of layout.css.devPixelsPerPx to 1.25

This affects the GUI and web content, not just the web content or just the text.

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Not sure if this is what you ask for, but you can increase the minimum font size on you browser. That way you'll have larger letters.

like this: increase-min-fint-size

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    not just the font size .... the whole webpage – Niks Jan 4 '12 at 13:33
  • scroll up the page - you might find your answer. – karla Jan 4 '12 at 13:33
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    that isn't permanent zoom – Niks Jan 4 '12 at 13:35
  • I made a little search - there seems not to be such an option. But wikipedia's acticle about firefox says, that it should remember your zooming settings for each site. – karla Jan 4 '12 at 13:40
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Control+MouseWheel zooms, and the zoom-level is remembered on a per-site basis, unless you clear your history.

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    (ctrl and + ) (ctrl and -) browser/tab wide zoom = same like ctrl mouse wheel up/down – Piotr Kula Jan 4 '12 at 13:36

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