I'm in trouble with firefox

[shaon3343]

HI, I'm using ubuntu 10.04 . I've been using firefox 3.6 for all these days but today I tried to install firefox 4.01 from firefox-4.0.1.tar.bz2 and I used these two commands : ==>

sudo -C /opt/ -xf firefox-4.0.1.tar.bz2
and

sudo ln -sf /opt/firefox/firefox /usr/bin/firefox

and after that I just cant start firefox !! Its saying :

Error running: Firefox Web Browser Failed to execute child process "firefox" ( Permission denied )

I've attached a screenshot of that error.
Please Help me retrieving my default Firefox .
Thanks in advance
Shaon

[dino99]

use the easy way: http://www.ubuntugeek.com/how-to-install-firefox-4-in-ubuntu-using-ppa.html

[pqwoerituytrueiwoq]

if you don't want to replace your firefox 3.6
http://ubuntuforums.org/showthread.php?t=1708905
2 days till firefox 5 comes out:popcorn: