Textfast breaks Reddit comment box

[SolemnTagger]

If Textfast triggers on certain sites it completely breaks the text box I'm typing in and I can no longer delete text...it's like all the text suddenly becomes immune to the backspace and delete buttons. Considering that most of the time I trigger Textfast by accident and thus the very first thing I want to do after it triggers is delete what it wrote this is very frustrating, but even if I wanted to keep what it inserted I would still have to type out the rest of my comment PERFECTLY because after TF triggers there is NO going back to correct any errors.
I encounter this problem most often on Reddit, but it has happened on other sites as well. Something about how their commenting system works just has beef with Textfast or vice versa.
So it would be awesome if you could fix this. It's super annoying. Either that or I would like to be able to blacklist certain websites so Textfast simply does not trigger on them, because I'm not even using Textfast to write Reddit comments so being able to blacklist Reddit so that the addon doesn't work there would actually be somewhat of a solution to this problem...for me at least.