I am not able to use the app. I get a need to sign in to Google error. (And I am signed into Google). My firefox version is: 59.0.2 (64-bit). Please let me know if you need more information.

Update: Clearing the cache, site data and active logins fixed the issue. Great product!

This is working great. This lets me access my all my Google Bookmarks and my Read Later list.

2nd edit:
To fix the problem of this not being logged in to one's Google account, clear Firefox data (cookies, cache, & active logins) and then go to a Google login-in page.

1st Edit: After some digging I found this out:
From browser console:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://accounts.google.com/ServiceLogin?continue=http://www.google.com/bookmarks/...
...
(Reason: CORS header ‘Access-Control-Allow-Origin’ missing)

These pages might shed light on the problem:
https://stackoverflow.com/questions/24371734/firefox-cors-request-giving-cross-origin-request-blocked-despite-headers#24383474
https://support.mozilla.org/en-US/questions/1152971

Works fine, thanks for a good work

The extension does not work while I am in Private Browsing mode. Is this extension designed to not work while in Private Browsing mode?

EDIT to reply to developer:
Ok, Thank you for your reply.

Passed more than half of the month while I'm using this extension and this is really great work!
Two questions for the author:
- Is it possible to add feature/option to make state of the bookmark tree permanent (in a way to keep tree as I leave it, with some opened bookmark items, i.e leafs)? This is very useful for people that have many bookmarks.
- Can you please provide some donation link, just to say thanks you and support development of this very useful peace of software?

Appreciate your work, keep on.

>>> Какие при этом сообщения в консоли выводятся (Ctrl+Shift+J)?

@fess
я вчера психанул, удалил файрфокс, вычистил после него весь мусор, затем поставил заново и установил твой аддон, только после этого авторизация заработала.
думаю, что файрфокс криво обновился с 55 до 56, когда и возникла проблема.

Before, you could sort the bookmarks so they'd be listed alphabetically. Now, I can't for the life of me figure out how to do so. Sad they tweaked things, though that might be necessary due to changes to Firefox.

Many Thanks! The add-on works again in the new version 1.0.1 and the drop-down menu finally works again as usual.
Also the new "read later" is a great addition.
For me, "Fess" is the best add-on to organize Google bookmarks.
Live long and prosper.