Just installed Firefox 4. It hangs when I open any website and type in, for example, an ID, or even just click on something, for example, "Compose", in my webmail site.

Here's the detail of what happens.
1. Turn on computer and then click on Firefox icon on desktop.
2. Firefox opens. Everything looks OK. Mr Bunsen's graphic is working fine.
3. Click on any webpage link. For example, a newspaper or an online webmail page. All looks OK until
4. Click on anything or type anything, such as in ID in a box, and bingo, the top line of Firefox goes from dark blue to very pale blue and the computer is hung. You cannot get out of Firefox or get Firefox to work.
5. Switch off computer.
Is this perhaps due to a clash of Add-ons. I run Avast anti-virus. McAfee came with Firefox 4 and I did not reject it. Is it conflicting wth something in my system and causing it to hang?

You can modify the pref <b>keyword.URL</b> on the <b>about:config</b> page to use Google's "I'm Feeling Lucky" or Google's "Browse By Name".
* Google "I'm Feeling Lucky": http://www.google.com/search?btnI=I%27m+Feeling+Lucky&ie=UTF-8&oe=UTF-8&q=
* Google "Browse by Name": http://www.google.com/search?ie=UTF-8&sourceid=navclient&gfns=1&q=
* http://kb.mozillazine.org/keyword.URL
* http://kb.mozillazine.org/Location_Bar_search

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