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Is there any way of identifying whether or not my visitors are using one of these plugin?

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.

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.

Is there any way of identifying whether or not my visitors are using one of these plugin?

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.

and how best to support it?

Avoid GET and use POST instead. Example:

 <form action="https://example.com/login.php" method="post">    
     <input type="text" name="username" id="username" value=""/>
     <input type="password" name="password" id="pwd" value=""/>
     <input type="submit" value="Sign in"/>
 </form>

Is there any way of identifying whether or not my visitors are using one of these plugin?

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.

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.

Is there any way of identifying whether or not my visitors are using one of these plugin?

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.

and how best to support it?

Avoid GET and use POST instead. Example:

 <form action="https://example.com/login.php" method="post">    
     <input type="text" name="username" id="username" value=""/>
     <input type="password" name="password" id="pwd" value=""/>
     <input type="submit" value="Sign in"/>
 </form>