Click the Firefox button, go to Add-ons, then Plugins. In the list, find '''Fun Web Products '''and click: "Disable". This plugin which usually comes bundled with 'free' programs interferes with browsing. See http://www.networkworld.com/newsletters/2003/1208web2.html ---- To downgrade to v3.6.17, do the following:<br><br> #Go to [http://www.mozilla.com/en-US/firefox/all-older.html Download Firefox v3.6.17] and download it to the desktop.<br><br> #Then go to Add/Remove Programs, scroll down to "Mozilla Firefox" and remove it, choosing to keep your bookmarks, customizations etc., (don't checkmark the box).<br><br> #Then reboot and delete the folder called "Mozilla Firefox" at this location: C:\Program Files\Mozilla Firefox<br><br> #Finally run the installation file you downloaded to the desktop earlier.<br><br> Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation.<br><br> ---- After you complete the installation, go to the [http://www.mozilla.com/en-US/plugincheck/ Plugins Check] page and update where necessary. ---- If your bank is adamant that they won't support v3.6.17, give them this link: http://blogs.comodo.com/it-security/data-security/the-recent-ra-compromise/ The fraudulent certificates which were inadvertently issued allow an attacker to create any site including online banking and previous versions of Firefox will not warn you that the site is a fake. The fraudulent certificates were blacklisted in v3.6.17 and above.

Well, Firefox 5 is a beta version, and most banks just don't support beta-level browsers. As far as not supporting the Firefox 4 release version, they risk losing customers over their lack of support for the latest release version of the 2nd most popular browser in use today.