Firefox 4 is no longer available. If upgrading, the only version that you can/should go to is Firefox 6.0.1, the current version. Firefox 7.0 is scheduled to be released on 09-27-2011 ('''''scheduled date is subject to change'''''). After Firefox 4.0, each upgrade replaces the prior version and the prior version is "abandoned" as far as security and stability updates are concerned. Installing Firefox 6 will preserve your prior bookmarks, passwords, etc. You can/should make a backup of your personal information for safekeeping; what if you have a hard drive failure? *See [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information] '''''and''''' [http://kb.mozillazine.org/Profile_backup Profile backup] To test the new version 6.0.1 and leave your current Firefox 3.6.21 intact, you can install Firefox Portable. Firefox Portable is not produced by Mozilla (but is based on Firefox released versions) and is not supported on this site -- has its own support forum (see below). Firefox Portable installs in a separate folder on your hard drive and keeps its profile (personal information) separate so that it does not interfere with your current Firefox installation settings or personal information (bookmarks, passwords, etc.). You can also install Firefox Portable on a USB/thumb/pin/jump drive. *Firefox Portable general information: http://portableapps.com/apps/internet/firefox_portable *Firefox Portable user forum: http://portableapps.com/forums/support/firefox_portable '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.''' ------------------------- Not related to your question, but... You need to update some plug-ins: *Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/ *Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.com/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox] *Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

firefox 6.o.1 password