I cannot move, resize, minimize, or close the browser window despite everything inside the window still working.

Question

I don't know what details are needed so I'll just rattle off anything that I can think of.
I am running an Asus laptop with windows 7. I have never had an issue with firefox in the past (beyond the usual freezing and some obvious issues with pop up ads that are par for the course with firefox since adblocker never does what it says.... not really. Lets be honest.) I am using Avast for my virus protection and it is also up to date.
My issue started about an hour ago when firefox stopped responding. The video I had playing kept going but I could not interact with anything. Assuming the program froze for the billionth time that week I rebooted it. This has always solved freezing issues in the past. Now, however, firefox is doing something new.
I can access the menus and almost everything on the window itself except for the minimize/maximize/close buttons, I cannot move the window at all, and I cannot manually resize it. I have also noticed that although videos will play, I can only click on their buttons if there is another smaller window overtop of firefox. The video controls will only appear that way and when I click them firefox naturally comes to the front and the video responds with the button I used but the buttons are gone again and I cannot resume playing without the smaller window back in front to make the buttons show again.
It's as if half of firefox is frozen while the other half is still running somehow.
I have no themes that could be causing this. Literally none. I only use firefox for the things that can no longer be opened in Opera so I have no need for any theme beyond default. The only addons I installed on purpose were adblockers (lord knows why. they don't DO anything.) though several other random things seem to have been installed over time to aid in one thing or another. Various plugins and players and versions of java, that sort of thing. But I have everything (and i mean EVERYTHING) in the addon menu disabled.
I have tried booting it up in safe mode (the program, not windows) and the problem is still there except now it won't show the menu bar at all unless I press the alt key first and even then it wont let me actually click on anything in the menu bar. When I try the whole bar vanishes. I had to close firefox with the task manager.
Rebooting will fix the issue for about 15 seconds before it all comes back.
Any attempts at updating have failed as it says I am already up to date on everything so I don't know what its issue is.
It's not an urgent issue right now as most of what i need to do can be done on the half screen window I am using, but some of my sites have buttons that literally vanish in anything but full screen and I imagine that this will be a much greater annoyance within a few days.

Answer 1

After following all the instructions given, I poked around safe websites as suggested. I am not sure why this step was needed, as websites functioned rather normally before I came here but I did it anyways and found that the websites still work the same as they did. I can still do everything I used to be able to do. I see no change in the function of the websites.
However, I still cannot resize, close, or move the browser window. I don't know if Netflix is a safe site or not (too many conflicting opinions on that one from the masses) so I don't know if the issue with the vanishing buttons is still there, but all the issues I had with the browser window itself is still there.
Even in safe mode the browsers three window control buttons on the top right refuse to let me use them and the window itself will refuse to be moved around.