User Agent: Mozilla/5.0 (X11; Linux i686; rv:21.0) Gecko/20130321 Firefox/21.0 Build ID: 20130321042014 Steps to reproduce: Ctrl+T, Aurora 'button' > New Tab or click the ( '+' ) new tab 'button' Actual results: NewTab appears but only rarely does Some of the thumbs appear, others are blank squares. I have Never had them all populate. ~/.mozilla/ProfileName/thumbnails directory (folder) is Always empty (all nightly versions since july, 2009).. //chrome/browser/content/browser/newtab/newTab.js calls for Cu.import("resource://gre/modules/PageThumbs.jsm"); ,but... there is No /modules/PageThumbs.jsm file anywhere in omin.ja Expected results: thumbs in NewTab should populate with a thumbnail of that page (url) on load.

i've checked other bugreports, e.g., https://bugzilla.mozilla.org/show_bug.cgi?id=726267 and have check the things mentioned in them e.g., browser.cache.disk.smart_size.enabled = false and seem all correct (in this exp. my ..cache.disk.. is true).. here is another screenshot of cache entries in 'about:config' Landis.