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layout.css.devPixelsPerPx value too big, and I cannot access about:config because it changed the font size (I foolishly put 500! Idiot). Can I change this value without going thru about:config?

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I wanted to decrease the font size of the bookmarks toolbar, and found that altering the value of "layout.css.devPixelsPerPx" does this. I did not know what effect going higher or lower would have, and I foolishly entered 500. This has rendered the GUI inoperable - is there another way of changing the value, without going through about:config?

I wanted to decrease the font size of the bookmarks toolbar, and found that altering the value of "layout.css.devPixelsPerPx" does this. I did not know what effect going higher or lower would have, and I foolishly entered 500. This has rendered the GUI inoperable - is there another way of changing the value, without going through about:config?

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You will have to edit the file prefs.js in the Firefox Profile Folder to remove that line or change the value to a more reasonable value.