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Since firefox 5 has been released firefox 4 seems to have been removed from the mozilla repositories (i.e. force version cannot be used).

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Is there any reason why you want to keep 4? 5 looks similar to 4, but with a few bugfixes and some new features. However 3.6 and 4/5 differ a lot in their appearance. –  Lekensteyn Jul 1 '11 at 7:47
    
You shouldn't use Firefox 4 anymore, since Firefox 5 is the security and stability patch for Firefox 4, which basically reached en-of-life and will no longer be supported. If you provide the reasons why you want to downgrade, we could try to help fix your problems with FF 5. See ubuntuforums.org/showthread.php?t=1712247 –  lovinglinux Jul 1 '11 at 13:52
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closed as too localized by Jorge Castro, Marco Ceppi Jan 3 '12 at 0:01

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In essence, you can't. There aren't that many major differences in the versions, and infact, if you use Ubuntu 10.04 and up, you will be upgraded to a newer version of Firefox automatically anyway.

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