Input fields are all messed up as far as input is concerned.

Question

Nexus 10, Android 4.3
If I respond to reddit threads there are times when I hit the text field and it shows a cursor, but as I type the text will not show. The text is being entered and I can see it in the keyboard suggestion. I have to blind type some text, hit the switch app menu and select Firefox again to see what I typed.
It also has a hard time determining where the cursor actually is ( this text box I'm typing in just did this when I tapped a word to edit it ). If I try to move the cursor it seems to be stuck where it last was no matter how many times I click to move it. It visually appears to move, but if I start typing the text replaces or types where I last was. Swapping to the app selection screen and back seems to reset the cursor properly after I tap again.
On top of that, there are times when I close a tab ( I know, not related to slowness,etc.) the content of the closed tab will show up overtop of the tab that should be showing.
Also, it doesn't matter if I set the about:config flag the the smart bar or whatever it's called, touching tre page makes my tab bar slide closed and I want it to remain open like the last version.
This latest version is just really bad and it's starting to piss me off!

Answer 1

It normally happens after a while of replying and browsing. I normally read reddit and reply to multiple posts and after probably 5(?) replies it starts acting up. If I hit the switch app button and swipe Firefox away and reload it it will sometimes be fine for a bit. In fact, when I went to reply to this post, I think I may have had Firefox open last night and it opened the reply from email. Upon clicking on the login link, I had changed my password and needed to re-enter it. I selected the password field, entered my password and found out it wasn't showing the entry on screen. I hit switch apps, selected Firefox, and it showed that I just added my new password to the end of the old one. I selected the password field to clear it and the input key board wouldn't render. It covered half the screen like it was going to come up but it was plain black. Switching apps, swiping Firefox away, going to email and reopening the reply link brought Firefox back up and let me login and reply.
TLDR; It seems like a memory leak of some sort. It mostly happens after a while of browsing and entering data in inputs. It's not just reddit. It happens on any page that has inputs.
To add... normally when browsing reddit, I'll long press posts I want to read and open then in new tabs while I scroll down the page, when I get a few pages down, then I'll close the first tab and work my way down the open tabs replying here and there. I'm not sure if it's cause by that but when I witnessed the problem above, that was the only tab I had open... but I don't remember if I was using Firefox last night before going to sleep. (I've been getting frustrated with this bug and been trying the nightly and beta builds, which also act up). I've even resorted going back to Chrome for some browsing but it's bookmarking isn't as easy to use as the Firefox home page and I don't have all my session data there.