Hello,

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Do you mean that you do not see all three window control buttons (Minimize, Maximize, Close) and that you activate the Maximize button?

Start Firefox in Safe Mode to check if one of the extensions (3-bar Menu button/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: 3-bar Menu button/Tools > Add-ons > Appearance
• Do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

You can try a different Windows theme and Windows background image (wallpaper) to see if that helps. Not all Windows themes seem to be compatible with current Firefox releases, so you may have to try out other themes if the one you currently use doesn't work as expected. If you use a non standard windows theme or made other appearance changes then try to revert those changes and use a (different) standard theme or Windows wallpaper.

I have a dash, a box and an X. When i move the window, it goes to FULL screen, and there is a dash, a DOUBLE box and an X. When i click the double box to size it down, it goes back to it's original location. how can i shut this off?

If you were to double click the top frame, it changes to full screen and back.

i move the window and it changes to full screen. when i click the double box to reduce it it goes to the place i was trying to move it from.