Rated 3 out of 5 stars

Does not work anymore as stated before with plasma-5.8 and firefox-49(?).

[Output from Browser-Konsole with kdebugdialog/Channel 9500]
...
uncaught exception: Unexpected propertybag item: hostnamensLoginManager.js:391:12
NS_ERROR_XPC_JS_THREW_STRING: Unexpected propertybag item: hostname'Unexpected propertybag item: hostname' when calling method: [nsILoginManagerStorage::searchLogins]

A promise chain failed to handle a rejection. Did you forget to '.catch', or did you forget to 'return'?
See https://developer.mozilla.org/Mozilla/JavaScript_code_modules/Promise.jsm/Promise

Date: Sat Oct 08 2016 16:03:31 GMT+0200 (CEST)
Full Message: Unexpected propertybag item: hostname'Unexpected propertybag item: hostname' when calling method: [nsILoginManagerStorage::searchLogins]
Full Stack: JS frame :: resource://gre/components/nsLoginManager.js :: searchLogins :: line 391
JS frame :: resource://gre/modules/LoginHelper.jsm :: searchLoginsWithObject :: line 169
JS frame :: resource://gre/modules/LoginManagerParent.jsm :: LoginManagerParent.sendLoginDataToChild< :: line 209
JS frame :: resource://gre/modules/Task.jsm :: TaskImpl_run :: line 319
...
[/Output from Browser-Konsole with kdebugdialog/Channel 9500]

I also tried to contact the author on his website,
but there is some kind of invisble captcha that nobody can ever solve.

This review is for a previous version of the add-on (1.1).