Talk:Browser.ctrlTab.previewsCount
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Bug 445369 – Allow closing tabs in the Ctrl+Tab panel with Ctrl+W removes support for this pref.
https://bugzilla.mozilla.org/show_bug.cgi?id=570056#c3 http://hg.mozilla.org/index.cgi/mozilla-central/rev/d5743c68c91a
It looks that only browser.ctrlTab.previews (false) and browser.ctrlTab.recentlyUsedLimit (7) are still used.
http://mxr.mozilla.org/mozilla-central/source/browser/app/profile/firefox.js#334 http://mxr.mozilla.org/mozilla-central/source/browser/base/content/browser-tabPreviews.js http://mxr.mozilla.org/mozilla-central/source/browser/base/content/test/browser_ctrlTab.js