Using a local html file as the new tab page in firefox
<p>I'm using Firefox 44.0 for Windows, and would like to use a html file hosted on the file system as the page that appears on a new tab page - it contains links and other resources that's useful for my workflow.</p>

<p>I'm using the "New Tab Override" plugin for FF which essentially restores the <code>browser.newtab.url</code> option. I get my local html file showing when I create a new tab page. </p>

<p>However, the problem is that the path to the file appears in the url bar so that whenever I start typing a url in the url bar (from when I want to go to a known location in the new tab), it's appended to the filepath, instead of replacing it. </p>

<p>Is there another way I can show a local file as a new tab whilst leaving the urlbar blank so I can type urls in when desired?</p>