I updated to Firefox 4 about a week ago using a PPA. Since that time is has frozen at least a dozen times. Out of complete frustration I decided to install Google Chrome. It can be found in the Ubuntu Software Center under google-chrome-stable. I have now switched to Chrome as my main browser. It just runs better and doesn’t freeze. It even has a sync feature built in. There is only one Firefox add-on I miss, the video downloader plug-in. But Google is now buying it so maybe it will appear in the app center.
If you don’t have Google Chrome in your repository, you can download it directly at: