How to downgrade to Firefox 4 on 11.04

Question

I just upgraded to Firefox 5 to find out that Selenium does not work on it. I'd like to downgrade to Firefox 4 but haven't found a way to do this.

How do you downgrade to Firefox 4 on 11.04?

Thanks in advance.

Answer 1

1. Start "Synaptic Package Manager"

2. Type in "firefox" in the quick filter and highlight it in the search result (the one w/ the green box next to the package name indicating that it is already installed on your computer)

3. Select from the menubar "Package" -> "Force Version"

   

4. Select 4.0 from the dropped down list "4.0+nobinonly-0ubuntu3 (natty)" and click "Force Version"

   

5. "Apply" changes

   

Answer 2

you can install firefox with repository .

and download firefox from firefox.com and run it .

Download Firefox from the Firefox download page to your home directory.
Open a Terminal and go to your home directory: cd ~
Extract the contents of the downloaded file:tar xjf firefox-*.tar.bz2
Close Firefox if it's open.
To start Firefox, run the firefox script in the firefox folder. 

~/firefox/firefox

Firefox should now start. You can then create an icon on your desktop to run this command.