Using Nightly 28.0a1, I'm having a problem with the text box fields when typing. I use Hacker's Keyboard which has onscreen arrow keys and I find it more convenient than fiddling with a tiny cursor thumb when editing text. On the Play Store Firefox it works just fine but on Nightly, any time I try to move the cursor with the arrow keys it jumps out of the text box and highlights other elements on the page. This is annoying beyond belief as it means having to resort to that imprecise thumb cursor that takes forever to get where you want it. Is this a known issue with the latest nightly builds?