Hi, yes that does seem to be a problem of magnitude. Unfortunately Mozilla only ok's Extensions submitted by Developers to be used with Firefox. They ok them only and give the Developer a web page to distribute their Extension from. You can contact Last Pass Support by email support@lastpass.com and raise the issue but it maybe quicker to post in their forums here : https://forums.lastpass.com/ I am sure this will be fixed very quickly. The good thing is is that it is only on a local machine which you have control over. Please let us know if this solved your issue or if need further assistance.