Goes out of text entry mode. Top bar fades to light blue. Thks
Go to Pull Down Menu, select Help and then select “Trouble Shooting”, then on right hand side, select button “Reset FF to its default state”. Close FF and relaunch. See if that works.
Check your extensions and plugins. Disable all that are suspect, If problem disappears, re-enable one at a time till you find the one not playing nice.