Invisible cursor in Google search field using FireFox

This morning the cursor and selection box disappeared while I was doing Google searches. My web browser is FireFox.

I wish I could detail exactly all that this bug entailed but I fixed the problem and until it returns I'm unable to say more.

How did I bring the cursor back to visibility? I went to View, left clicked the mouse to bring up a short menu and finally clicked on Full Screen F11. All returned to normal. Simply hitting F11 might be a short cut.

[Simply tapping F11 at the top of the keyboard is an immediate solution. The cursor disappeared again and I got a chance to test the short cut. One tap of the F11 key, the full screen appears and the cursor is immediately visible.]

I understand that pointing at the Firefox icon, found in the top left corner of the monitor, clicking the mouse to activate the drop down menu and then selecting Maximize will also make both the cursor and the selection box visible again in the Google search field.

Hope this helps all who encounter this odd problem.