How can I set Firefox to default to custom zoom level? I have modified about:config to adjust my zoom increments (toolkit.zoommanager.zoomvalues) and enable Firefox to remember specific site zoom settings (browser.zoom.sitespecific). It seems to me this should be an easily identifiable setting in about:config but I haven't been enable to decipher it. And please don't suggest using an add-on like NoSquint - that is not the solution I am looking for.... I am using Firefox 47.0 on Windows 8.1, if that may be relevant.