Just tried accessing the LastPass website - no problem here. Tried to access the LastPass “vault” through the icon in Firefox - no problem. I’m using the latest version of Firefox (25.0.1).

Also tried the same thing using Internet Explorer 11 - no problems accessing both pages.

Using avast! Internet Security (2014.9.0.2008) and latest virus definitions.

Sorry I wasn’t able to offer any suggestions to remedy your problem both everything is working fine here. Perhaps try a “repair” of avast! through the Control Panel . . .