See I updated Firefox from 3.0 to 3.5  in the website bellow:
https://help.ubuntu.com/community/FirefoxNewVersion

I clicked in the link apt:firefox-3.5 

> Date: Tue, 28 Jul 2009 11:49:02 +0000
> From: <email address hidden>
> To: <email address hidden>
> Subject: RE: [Bug 405513] Re: Firefox 3.0 slow
> 
> 
> Now I updated to Firefox 3.5 and problems reduced. I could download large files. Every click still got stuck but less than Firefox 3.0. And Flash Player 10 that has one square block divided by 3 areas and each area has image moving. It still mix the image areas inside the block.
> My motherboard has two Lan Internet Connectors RJ45. I use both connected to my router. Maybe Firefox got stuck becouse it get lost with motherboard with two connectors and Intel Core i7 with 8 cpus (4 real and 4 virtual) and ram of 12GB and Graphic Card of 2 GB ATI Radeon HD4870x2. 
> 
> > Date: Mon, 27 Jul 2009 21:50:13 +0000
> > From: <email address hidden>
> > To: <email address hidden>
> > Subject: [Bug 405513] Re: Firefox 3.0 slow
> > 
> > 
> > ** Attachment added: "Dependencies.txt"
> >    http://launchpadlibrarian.net/29584892/Dependencies.txt
> > 
> > ** Attachment added: "ExtensionSummary.txt"
> >    http://launchpadlibrarian.net/29584893/ExtensionSummary.txt
> > 
> > ** Attachment added: "profiles.ini.txt"
> >    http://launchpadlibrarian.net/29584894/profiles.ini.txt
> > 
> > -- 
> > Firefox 3.0 slow
> > https://bugs.launchpad.net/bugs/405513
> > You received this bug notification because you are a direct subscriber
> > of the bug.
> > 
> > Status in “firefox-3.0” package in Ubuntu: New
> > 
> > Bug description:
> > Binary package hint: firefox-3.0
> > 
> > Since I upgrade to Firefox 3.0 it become very slow, connection drops every time, it is difficult to open new tabs and new window. It become impossible to download big files like 100 MB. 
> > Every click Firefox got stuck and I need to open and close new firefox window to make the previous window go to the click I want it to do.
> > It also looks like it got problem with flash player 10 that make it slow and does not show moving parts as fast and accurate as it should do.
> > 
> > ProblemType: Bug
> > Architecture: amd64
> > DistroRelease: Ubuntu 9.04
> > Package: firefox-3.0 3.0.12+build1+nobinonly-0ubuntu0.9.04.1
> > ProcEnviron:
> >  LANG=pt_BR.UTF-8
> >  SHELL=/bin/bash
> > SourcePackage: firefox-3.0
> > Uname: Linux 2.6.28-13-generic x86_64
> 
> _________________________________________________________________
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> 
> -- 
> Firefox 3.0 slow
> https://bugs.launchpad.net/bugs/405513
> You received this bug notification because you are a direct subscriber
> of the bug.
> 
> Status in “firefox-3.0” package in Ubuntu: New
> 
> Bug description:
> Binary package hint: firefox-3.0
> 
> Since I upgrade to Firefox 3.0 it become very slow, connection drops every time, it is difficult to open new tabs and new window. It become impossible to download big files like 100 MB. 
> Every click Firefox got stuck and I need to open and close new firefox window to make the previous window go to the click I want it to do.
> It also looks like it got problem with flash player 10 that make it slow and does not show moving parts as fast and accurate as it should do.
> 
> ProblemType: Bug
> Architecture: amd64
> DistroRelease: Ubuntu 9.04
> Package: firefox-3.0 3.0.12+build1+nobinonly-0ubuntu0.9.04.1
> ProcEnviron:
>  LANG=pt_BR.UTF-8
>  SHELL=/bin/bash
> SourcePackage: firefox-3.0
> Uname: Linux 2.6.28-13-generic x86_64

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