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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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up vote 6 down vote accepted

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.

Notice: Those settings is not working on 29. I think that is a bug.

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it's working .. Thank You :) – Niks Jan 4 '12 at 13:43
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
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

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
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

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 – ppumkin Jan 4 '12 at 13:36

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