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Firefox no longer hides the tabs bar in full screen mode. This just surfaced

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Firefox no longer hides the tabs bar in full screen mode. This just surfaced. Go to applications tab, press slash with the outward arrows to go to full screen. This is a new problem. Tabs remain

Firefox no longer hides the tabs bar in full screen mode. This just surfaced. Go to applications tab, press slash with the outward arrows to go to full screen. This is a new problem. Tabs remain

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Is the following preference set to the default value of true? browser.fullscreen.autohide

https://support.mozilla.org/en-US/kb/about-config-editor-firefox

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You can right-click free space on a toolbar in Full Screen mode and place a checkmark on "Hide Toolbars". See also: