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I also have this same problem "Since yesterday (March 14, 2019) the tasks appear for a very short time and then there is only a white window"

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Oceniono na 3 z 5 możliwych gwiazdek

It has a lot of potential, especially since Lighting is so poor as a synched calendar. Sadly, I installed it today, and like many others find that 'Tasks' appear in their window but are visible for only a second or so, then they disappear leaving a blank window that cannot be closed. This is a pain, not only can I not see my tasks, but the rest of the calendar is made small by the blank task window. Shame., I hope it improves because TB needs a good synched calendar.

On the positive side, the Google calendar appears exactly like it does in the GUI interface, and changes made in your calendar in both the tab and the web GUI appear in the other calendar within a few seconds. Creating new events, deleting events and editing existing everts can be made in either calendar.
Once the task window problem is resolved it will be a really good addon.

Ta opinia jest o wcześniejszej wersji dodatku (1.4). 

Oceniono na 3 z 5 możliwych gwiazdek

It's good to be able to check calendars and tasks without signing in to Google on browser. However, since a couple of weeks ago, the tasks view keeps disappearing few seconds after loading. The settings window doesn't work either. I'm using another option 'Provider for Google Calendar' at the same time, when I want to copy and paste schedules. It also has problems in tasks management, though.

Ta opinia jest o wcześniejszej wersji dodatku (1.4). 

Oceniono na 4 z 5 możliwych gwiazdek

good work except Tasks - they disappear after 1-2 seconds after loading.

Ta opinia jest o wcześniejszej wersji dodatku (1.4). 

Oceniono na 5 z 5 możliwych gwiazdek

So many poeple with an Android device make use of Google Calendar. So why not get easy access to it from your Windows computer? Making it pop up as a side effect of checking your mails in Thunderbird is the ultimate idea.
Thank you so much! Had been using "Google Calendar Tab for years until Mozilla decided to change s.th. by introducing TB 60, which did no longer allow this great trick. Emmanuel Roecker found a way to reactivate it by programming "Open Google Calendar". so: 5 Stars only because there are no more.

Ta opinia jest o wcześniejszej wersji dodatku (1.4). 

Oceniono na 5 z 5 możliwych gwiazdek

Very good

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Oceniono na 5 z 5 możliwych gwiazdek

Thanks Eddy. Works like a dream

Ta opinia jest o wcześniejszej wersji dodatku (1.4). 

Oceniono na 5 z 5 możliwych gwiazdek

UPDATE Jan 28 2019:
If Thunderbird cookie settings are set to refuse cookies, you must add an exception for https://calendar.google.com ! A simple exception for the entire google.com domain does NOT work! Once I did this, the Open Google Calendar v1.4 extension works as promised: i.e., it opens my Google calendar account in a Thunderbird tab.
==============================
Original rating 1, with review below:
==============================
Doesn't work with Thunderbird 64 bit v.65.03b
returns error from Google:
"400. That’s an error from Google:

The requested URL was not found on this server. That’s all we know."
==========
I will upgrade review when extension starts working.

Ta opinia jest o wcześniejszej wersji dodatku (1.4). 

Oceniono na 4 z 5 możliwych gwiazdek

I use this add-on for years. First "Google calendar Tab", now "Open Google Calendar", but I still have the same problem:
Every day, when I open the calendar for the first time, I have to input my google-e-mail-adress and my google-passwort.
Is there no possibility, that the calendar opens without this procedure?
This is the only reason, why I dont give five stars

Ta opinia jest o wcześniejszej wersji dodatku (1.2). 

Oceniono na 1 z 5 możliwych gwiazdek

This isn't working at all for me. I click the icon and nothing happens. If I got to options it asks for URL, but then nothing.

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Oceniono na 2 z 5 możliwych gwiazdek

Unfortunately, this does not work for me. It asks for authentication details every time Thunderbird starts.

Ta opinia jest o wcześniejszej wersji dodatku (1.0). 

Oceniono na 5 z 5 możliwych gwiazdek

Not only does this bring Google Calendar tab back to TB 60.* it fixes some of the minor annoyances there were with the now abandoned GCT add-on, so it's an improvement, not just a replacement. Merci pour cela, Emmanuel!

Ta opinia jest o wcześniejszej wersji dodatku (1.0). 

Oceniono na 5 z 5 możliwych gwiazdek

Finally Google Calendar Tab again. Thank you very much.

Ta opinia jest o wcześniejszej wersji dodatku (1.0). 

Oceniono na 5 z 5 możliwych gwiazdek

Thk for this module! It works perfectly! Just hope that the next version of ThBd will not desactivated it ; - )

Ta opinia jest o wcześniejszej wersji dodatku (1.0). 

Oceniono na 5 z 5 możliwych gwiazdek

Does what it is supposed to: Enablement of the google calendar tab extension on Thunderbird 60!

Some remarks though:
- The "Open Google calendar in a Thunderbird tab" icon is a wee bit big and makes the toolbar unnecessarily bigger in height
- Support for Thunderbird beta (currently 64.*) would be great (however, I guess this extension would have to be converted to the newer webextension format)...

Ta opinia jest o wcześniejszej wersji dodatku (1.0). 

Oceniono na 5 z 5 możliwych gwiazdek

Thank you for updating this addon! It's great.

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Oceniono na 5 z 5 możliwych gwiazdek

Was shocked this morning to find Google Calendar Tab disabled and apparently abandoned by the author. My pain was quickly gone when I found this kind fellow's replacement. Worked like a charm, just the the original. "Lightning" is simply horrid, like it's 1996 or something, and is not a viable alternative.

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Oceniono na 5 z 5 możliwych gwiazdek

Thank you!! This works great. Thunderbird was updated and I lost my google calendar, but now it is back. Google calendar is essential for my scheduling. Perfect!! A+!

Ta opinia jest o wcześniejszej wersji dodatku (1.0). 

Oceniono na 5 z 5 możliwych gwiazdek

Thanks for updating the compatibility, Emmanuel!

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Oceniono na 5 z 5 możliwych gwiazdek

Awesome and very useful for me. It work with last version 60.3
Thank's ;)

Ta opinia jest o wcześniejszej wersji dodatku (1.0).