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LastPass was working before Firefox 5 beta today. What happened?

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I allowed the auto update of Firefox 4. I was not having any problems with LastPass. When I restarted Firefox LastPass was disabled. I tried reinstalling the program but Firefox will not take the plugin.

I allowed the auto update of Firefox 4. I was not having any problems with LastPass. When I restarted Firefox LastPass was disabled. I tried reinstalling the program but Firefox will not take the plugin.

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https://addons.mozilla.org/en-US/firefox/addon/lastpass-password-manager/

Last Pass is supposed to be compatible with Firefox 6.0a2, so Firefox 5.0b2 shouldn't be a problem. Open the Add-ons manager Tab - {Ctrl + Shft + A} - right-click that extension - use Find Updates. See if that forces an update for that extension.

BTW, you must be on the Beta Channel for updates, Firefox won't be a release version for at least another month to 6 weeks. There should be a channel changer feature in the Help > About Firefox.