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What happened to firefox?? I was working in it and had to stop and restart and the display was completely different and cannot get back to where I can chose from favorites or have yahoo toolbar.....

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and now firefox goes into a full screen mode....when do get into a web site, back button is not available to go back to home page

and now firefox goes into a full screen mode....when do get into a web site, back button is not available to go back to home page

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F11 toggles the Full Screen mode on & off.