How can I uninstall Firefox 4 and reinstall the previous edition?

Yesterday I upgraded to Firefox 4. Sorry, but I do not like it at all, the rearrangement of "bars" at the top of the screen, removing the down arrow that was next to the "back arrow/forward arrow, to allow you to see a small current "history list.' But mostly, the fact that I can not use my Norton Internet Security, which has all my 'user names' and 'pass words'; which cost over a hundred dollars.
I want to change back to the previous edition of Firefox; which I purchased several years ago, and have been upgrading since then.
Thank you.

Maybe wait another day because Firefox 5.0 will be released on June 21 and maybe that version works better.
* Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html
* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
Make sure that you allow the plugin-container process in the firewall and other security software.
See also:
* [[No sound in Firefox]]
* [[Video or audio does not play]]
You can click the Volume icon on the Windows Taskbar near the clock and click the Mixer link at the bottom to open the mixer. 
You can adjust the volume level for each application in that window, so make sure that Firefox is not muted or set at a low level. 
You will only see the Firefox program in the Mixer if you are on a website that plays sound. 
Also check the volume setting for the plugin-container process.

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