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We downloaded you newest version and cannot print to our 2 printers and toolbars and securithy icons have gone missing.

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My daughter and I downloaded your latest download to update to your newest version of Firefox and it deleted certain toolbars and a security icon I had for banking. We both cannot print to our printers ever since we did the download. Help please!

My daughter and I downloaded your latest download to update to your newest version of Firefox and it deleted certain toolbars and a security icon I had for banking. We both cannot print to our printers ever since we did the download. Help please!

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Older add-ons that don't state they are compatible with Firefox 4 are disabled during the installation. If you use Tools > Add-ons, you can check for updates. If they are add-ons you can't live without, you could go back to Firefox 3.6 for a while until they catch up.

I'm not sure about the printing. What happens when you try to print?

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On my printer, nothing will print at all. On my daughter's printer, she gets funny fonts with half the print missing on the upper and lower areas and crazy mumbo jumbo too. If I delete Firefox 4 and reinstall Firefox 3.5, how can I get the security icon I had back for doing on-line banking?

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The security lock is gone with the Statusbar being removed from Firefox 4.0. The Site Identity Button provides better security information than the "lock" did.
https://support.mozilla.com/en-US/kb/Site+Identity+Button

You can add a padlock to the location bar with the Padlock add-on- https://addons.mozilla.org/firefox/addon/padlock-icon

As far as printing problems, see this:
http://kb.mozillazine.org/Problems_printing_web_pages