Usually I only see that sort of thing when an ad that would have taken up that space gets blocked but the page doesn't redraw to move the footer content.
Firefox
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Disabled all extensions and tracking protections and there was no difference.
Hmm, has me stumped, then. Could just be a poorly designed site and not necessarily a problem inherent with the browser.
It's all sites with a sticky footer though, not just this one. When I get home I was going to submit a bug report to Mozilla.
I've seen this, and more than once. But don't know what it has to do with
Yes, this happens to me on m.youtube.com with Firefox for Android.
Never seen that in Firefox on iphone.
Firefox on iPhone isn't Firefox in the way that matters here. All iOS browsers are forced to use Safari's rendering engine. iOS alternate browsers are just different UI and things like bookmark management on top of Safari.