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or, if you wish to personally cross @marekr 's palm with silver, I’m sure he will contact you with his secret squirrel address. 
Thanks for this info, jmk.
Thanks for report and comments, marekr. What does “hackfix” mean? Is that something different compared to a solution?
It means it’s like duct tape. There is a problem and there is probably a deeper more technical solution that could fix it correctly for this and future cases of windows having float on top issues. But that can be more hours of debugging to figure it out.
Or I can just apply duct tape on these two windows and call it a day.
Ok, well explained. I hope it can continue working at least like it currently does in the latest Nightlies, so far with help of duct tape and within some time also be transferred into stable version of v8 and later why not v9. Good luck, pls check messages.