Also present in Safari for iOS and IE for Windows Phone 8.1. NB: some pages are not convertible in Safari snd IE. I want to emphasize it's still very useful when it works. I use desktop version in ~ 1/2 to 2/3 of my browsing.

I cannot find any way to do this.

Some mobile pages have a "full site" link, usually toward the bottom.

To submit suggestions for new features, you can use this site:

https://fxos-ios-browser.ideas.aha.io/ideas/new

Or the Settings dialog:

• Tap the tabs button
• Tap the gear/wheel/cog icon
• Tap "Send Feedback" to open the feedback page

At some point, this was added: long press the reload button, as described in this article: Viewing Desktop Sites on Firefox iOS.