title: Force Firefox to reuse existing tab for modified HTML file
body: <p>If Firefox is already displaying a local HTML file on my PC in a tab (address = "file:///...") and I modify the file using my favorite external editor, sending the file to FF to display the edits results in FF opening a <em>new</em> tab with a fresh instance of the original file, rather than searching to see if the file is already open it it and reusing that tab.</p>
  
  <p>Sure, after editing the file I could reopen Firefox, navigate along the tab bar to the existing tab for that file and click Refresh. But IMO FF should be capable of doing this for me. In my work, by the time I need to refresh FF, the tab currently open is not likely to be that of the file I am editing, so I continually need to return to the original page to refresh it.</p>
  
  <p>My efforts to work around this include:</p>
  
  <p>1)In about:config, *setting browser.link.open_newwindow* from 3 to 1.</p>
  
  <p>2)Running Firefox and passing it either the filename or the URL to the filename (as <em>-url</em> parameter).</p>
  
  <p>3)Looking for a suitable add-on.</p>
  
  <p>I am not fond of either Firebug or Aurora and prefer my own editor (EditPlus), which with I am far more comfortable, to edit web pages. However, its inbuilt browser does not display properly on my screen, so I need to view results of edits in Firefox.</p>
  
  <p>Can anyone suggest a solution to this problem? I've searched here without success. The best solution would be another about:config setting. Thanks in advance.</p>
  
  <p>(added) After all, in EditPlus, if I send it a file (in document-centric mode) which it has already opened, it simply changes focus to the existing tab. Why can't FF do this?</p>