old_contents: pref("extensions.vault-shortcut.exe-path", "");
  pref("extensions.vault-shortcut.lastpass-url", "");
  pref("extensions.vault-shortcut.browser", "firefox");
  
new_contents: pref("extensions.vault-shortcut.exe-path", "");
  pref("extensions.vault-shortcut.lastpass-url", "");
  pref("extensions.vault-shortcut.browser", "chrome");
  
subject: Change default external browser to Chrome Chrome seems to load the LastPass extension faster than Firefox does.