Changing default view mode in Firefox to Desktop Using Firefox Mobile for Android. I want to lock the option for Desktop mode on by default. The menu option only applies per-tab and is forgotten if I open a new tab.

I have looked around at extensions and in about:config without finding anything.

Can anyone help?
Have you looked at this extension?

Description:


  About this Add-on
  
  This add-on enables desktop mode by default; that is, "Request Desktop
  Site" is always checked whenever opening a new tab. This is designed
  for users with larger screens (primarily tablet users).
  
  NOTE: Make sure "Request Desktop Site" and/or Phony are disabled when
  viewing this page; otherwise, you may not be able to see the install
  button.


EDIT: Take this tutorial you can:


In the Firefox address bar, type "about:config" and press Enter.
Tap the "Add a New Setting" button, then select "String" as the type.
For name, enter "general.useragent.override."
For value, enter the browser user agent string you want to use. You can do a Google search for the user agent strings of your preferred browser and OS. In this example, we're using the user agent string for the desktop version of Firefox 17 on Windows 7.


  Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101
  Firefox/17.0

Restart Firefox and confirm that Web sites are loading the desktop versions.
That's it. If you want to change the user agent later, go back to about:config and search for "general.useragent.override." Hit the Modify button to change the user agent or the Reset button to remove it.