I want to make sure visitors to my website have the best experience possible so I want them to be able to use LastPass and other Password Managers.Is there any way of identifying whether or not my visitors are using one of these plugins?
How can I tell if my website visitors are using LastPass or other password managers?
security;forms;ux
Yes.Users can install LastPass as a browser plugin. Thus you can rely on client side scripting languages to check if LastPass is installed. For instance, using NavigatorPlugins.plugins allows you to get the  a PluginArray object, listing the plugins installed in the application:function getLastPassVersion() {  var lastpass = navigator.plugins['LastPass'];  if (lastpass === undefined) {    // LastPass is not present    return undefined;  }  return lastpass.version;}Note also that what you are asking for is commonly implemented and used by browser fingerprinting technologies.