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My web pages are being displayed without the Mozilla Firefox borders, and I cant view the applications, places and system bar on the top. I accidentally pressed some button and I cant get the default settings back. Can anyone help me out with this?

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You probably pressed F11.... Press it again – Seth Sep 5 '13 at 13:59
Close-voters: This particular question clearly applies to currently supported releases also, and the solution is known. There is no reason to close this. anjani singh: With that said, you should definitely not use the desktop version of Ubuntu 10.04 LTS. 10.04 remains supported only for server systems with out GUIs running a very small subset of all packages. Your system doesn't updates for newly found security vulnerabilities, so using it is risky. You should use a currently supported release of some operating system instead; I recommend just upgrading to Ubuntu 12.04 LTS. – Eliah Kagan Sep 5 '13 at 19:12

As Seth says, Firefox is probably in full screen mode. F11 both enters and leaves full screen mode. So try pressing F11. That's probably the button you pressed by accident; pressing it again should bring you back to normal windowed mode.

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