1. Desktop by Default Addon

Desktop by Default is a small addon for the mobile Firefox (works only on Android) that checks the “Request Desktop Site” option whenever a new tab is opened. This will ensure that all the websites are rendered in desktop mode.

2. Manually setting the user agent

If you are not a fan of addon, another way is to set a string to override the user agent of mobile Firefox. One thing to note is that it will render the “Request Desktop Site” option useless.

  1. Open a new tab in mobile Firefox and type in the address bar “about:config“.

  2. Click the “Add a New Setting” link. Select “String” when it shows a popup.

  3. Enter the string “general.useragent.override” for the name.

  4. Next, go to UserAgentString and search for the desktop user agent that you want to use. In this case, I will use “Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:25.0) Gecko/20100101 Firefox/25.0“. Enter it as the value for the new “about:config” field created above. Click Ok.

That’s it. Restart your Firefox browser and it should render websites in desktop mode now.