Ran into this problem while setting up a gmail account on Thunderbird

“You've reached this page because we have detected that cookies are disabled in your browser. The page you attempted to load cannot display properly if cookies are disabled. Please enable cookies and retry the operation or go back in your browser.”

The solutions that came up in search did not solve the problem. I figured it out.

It has nothing to do with enabling cookies in Thunderbird. It does not hurt to enable before you do the following steps. In Thunderbird enable cookies Options > Privacy. You can change this around at any time and it makes no difference what the Thunderbird Privacy setting is.

The first thing I did though the order may not be important just the settings.

Set up your new g-mail account in Thunderbird -e-mail and password - click OK.

In set up configuration change the IMAP and STMP from gmail.com to googlemail.com.

Click Advance Config button. This will set up the E-mail account in Thunderbird.

Go into your Thunderbird account server setting through accounts> view settings for this account and change security settings> authentication method to Normal password Click OK

Sign in to your Google Account in a browser. Go to Sign-in & security> Apps with account access> Allow less secure apps turn that to On. Now go back to Thunderbird and click on Inbox and your Thunderbird account should fill and work.

WYSIWYG does not happen to posting here. Hopefully this will be a better formatted version of the above. No editing of post?? Really need to update forum tools.

Hmm, so you are having issues with the oAuth2.0 authentication. somewhere you have cookies disabled.

Are you running some sort of add removing add-on they are good at messing up settings, as are anti virus products. But I suggest you get whatever it is fixed as Oauth2.0 is the authentication process being pushed by Google and other large internet players across the web. It is only a matter of time before the plain password is simply not allowed at Google. It has already happened pretty much at ATT and Yahoo.

So are you saying that if I have cookies disabled anywhere on my computer that will affect my Thunderbird accounts? all browsers and their add ons don't work independent of each other and Thunderbird? Does Firefox work independent of Thunderbird? I definitely have add blockers in Firefox? I can understand anti-virus program or central windows program impacting a Thunderbird account and will look into it. I ask these questions because I don't know what I assume maybe correct. I thought Thunderbird was a stand alone program and only add-ons really have any effect? I will check these out also and see if I can oAuth2.0 to work.

OK what I have done. Changed Normal Password to oAuth2 Changed Google e-mail account to not allow less secure apps. Thunderbird Privacy Add Exceptions- Allow https;//gmail.com, googlemail.com, and google.com Interestingly when I added allow https://googlemail.com a bunch of other exceptions were added Allow. I looked under Thunderbird Privacy Cookies there was only one google cookie in there an NID advertising. I deleted it. Obviously google has no problem setting advertising cookies. Still got the enable cookie error as stated in the original post. I tried both google e-mail servers gmail.com and googlemail.com still got cookie error message. Turned off Norton's anti-virus e-mail scan still cookie error message. I didn't think this would be the problem as all Norton/Thunderbird/Gmail user would have the same problem. Gave up and went back to Normal Password, googlemail.com server, allow less secure apps in google e-mail settings.

I thought Thunderbird was a stand alone program

It is.

I tried both google e-mail servers gmail.com and googlemail.com still got cookie error message.

You just need to allow cookies in Thunderbird for https://accounts.google.com

Thanks that solved the problem.

Just for latter readers of this thread.

Added Allow Exception https://accounts.google.com in Thunderbird>Privacy>Exceptions

In Thunderbird Account Settings changed Normal Password to oAuth2. using servers gmail.com or googlemail.com does not matter both work.

Turned off Allow less Secure Apps in your gmail account settings in Google.

What is interesting is that I "Allow" an Exception of google.com and I guess that does not include subdomains.