Is there away to prevent the auto-unhide of the menu bar in full screen mode when the cursor moves to the top of the screen? I have searched for answers to this and found some old posts about creating a userChrome.css file but I couldn't get it to work.

Here's my use case. I access a remote desktop through Citrix for work. I use a browser via Citrix Lite instead of Citrix Workspace because the desktop will dynamically adjust to the window size when I don't need it in full screen which Citrix Workspace will not do. However, the auto-unhide feature of menu bar when the browser is in full screen mode also causes the desktop to dynamically adjust when it drops down and again when disappears. This forces me pause when trying to work because it happens often since I'm using a a large monitor with multiple applications open with tool bars on the top rows. I know that I can not hide the menu and address bar but don't want to lose the extra screen real-estate. I would much rather have a keyboard shortcut to reveal the menu bar or some other option.