No, on mobile Firefox that shows an empty 'loading' page and not the image.
It's not just Firefox which is broken, with Chrome it's impossible to zoom into an image as it redirects the i.imgur.com/xxx.ext links to the HTML wrapped page with a low-fidelity thumbnail and no way of extracting the original.
Interestingly when I open that link in my current window I get redirected to the imgur UI, however if I open in an incognito tab it loads the image directly.
It's not just Firefox which is broken, with Chrome it's impossible to zoom into an image as it redirects the i.imgur.com/xxx.ext links to the HTML wrapped page with a low-fidelity thumbnail and no way of extracting the original.