Latest Firefox download is here [ ftp link for download latest firefox ]
Download latest firefox and all firefox versions Click HERE or http://ftp.jaist.ac.jp/pub/mozilla.org/firefox/releases/
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How to enable firefox button in firefox4
Right click on the Tab Bar and uncheck the Menu Bar Option if you using firefox 5 already it apply! [to hide firefox menu press F10] See Firefox Button !! Have Fun :)