You can check for issues with Total Cookie Protection. *https://support.mozilla.org/en-US/kb/total-cookie-protection-and-website-breakage-faq *https://support.mozilla.org/en-US/kb/introducing-total-cookie-protection-standard-mode Start Firefox in <b>Troubleshoot Mode</b> to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if <b>hardware acceleration</b> or if <b>userChrome.css/userContent.css</b> is causing the problem. *switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes *do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window *https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode *https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Thanks, but pretty generic answer to a pretty specific question. As I said, it works in private mode. The extensions still active, them the same, Chrome the same, etc. And it is a specific JSON error. All of the above acknowledged. Of course, troubleshooting (as Private Window) will work. Total cookie protection on in BOTH standard and Private. Looking for something in between that causes it to complete in Private, but not standard. Thanks.

Also mentioned repeated attempts get me locked of of this account for 24 hours. SO any attempted solution shoul dbe targeted and stand a decent chance of success.

So all your extensions are enabled in PB mode? Any messages in the Web Console that look relevant? What response do you see in PB mode for this specific request?

All extensions are. None I can find that are not. In PB mode, it just works! I get logged in as expected after entering login and password. I have not looked at this either failing or succeeding in web console. Good idea. I wish I knew how many attempsts over what period of time wor without a successful login or....it takes before being locked out so I can test more easily and know I will not get locked out. The error is pretty specific and appears to be Oauth. But little I can find searching.

OK, here comes TMI :) Hopefully this will help you help me.... I am logged in to another part of the domain in another tab. I go to new tab to login here and before I attempt I get this: ''The script from “https://tmobilees.mpeasylink.com/mpel/mpel?href=https%3A%2F%2Fcommunity.t-mobile.com%2F&ref=&lang=en&country=&curr=undefined&region=” was loaded even though its MIME type (“”) is not a valid JavaScript MIME type. community.t-mobile.com AppReady.allowLoadingElements() has not been called which might be an error. Make sure the app component calls it, that all route resolvers resolve, and there aren't any previous errors. rollbar.min.js:1:64172 '' After I try I get this: ''Cookie “incap_ses_1341_2634229” has been rejected for invalid domain. initSession GET https://sso-us-west-2.api.insided.com/auth/oauth2/return?code=02.ettPpJZ97yYkA5D4H&state=ZIL1P9SoQm&session_num=0434ab17496625bd&userId=U-f01b0448-c2a7-4c72-9a12-5280adf3a0d9 [HTTP/2 400 Bad Request 84ms] tradedesk TO BE BLOCKED FOR DONOTSELL utag.js:194:144 Loading failed for the <script> with source “https://cdn.appdynamics.com/adrum/adrum-latest.js”. v2:1:1 Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://smetrics.t-mobile.com/b/ss/tmobusprod/10/JS-2.25.0/s92024250304563. (Reason: CORS request did not succeed). Status code: (null). Content-Security-Policy: The page’s settings blocked the loading of a resource at https://sso-us-west-2.api.insided.com/favicon.ico (“default-src”). 2 FaviconLoader.jsm:180:19'' See image: Then I login SUCCESFULLY in a Private Window and the erros are so long I had to create a text file - attached. But it works there!! Ahh, cannot upload a text file? Would you like to see all the contents? I'll do it in the nextt post and you can delete tat post if you like. ~Bob

This is from a SUCCESSFUL login in PB!! Too long for one post. More in next. Some cookies are misusing the recommended “SameSite“ attribute 9 Cookie “visid_incap_2634229” has been rejected for invalid domain. authenticate Cookie “incap_ses_1341_2634229” has been rejected for invalid domain. authenticate Cookie “visid_incap_2634229” has been rejected for invalid domain. authenticate Cookie “incap_ses_1341_2634229” has been rejected for invalid domain. authenticate This page uses the non standard property “zoom”. Consider using calc() in the relevant property values, or using “transform” along with “transform-origin: 0 0”. community.t-mobile.com Some cookies are misusing the recommended “SameSite“ attribute 20 Google Analytics and Tag Manager is being shimmed by Firefox. See https://bugzilla.mozilla.org/show_bug.cgi?id=1713687 for details. sandbox eval code:1:9 cdl:: Debug is DISABLED rollbar.min.js:1:64172 Path :/ rollbar.min.js:1:64172

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community.t-mobile.com:569:23
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(Reason: CORS request did not succeed). Status code: (null

You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History"). Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be careful. If you have a password or other data for that domain that you do not want to lose, make sure to backup this data or make a note. You can't recover from this 'forget' unless you have a backup of involved files. If you revisit a 'forgotten' website, data for that website will be saved once again. *https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

And you think that fixes this issue? Or just a temporary bandaid. And then why does it work in PB?

A major difference between a regular window and a private window is that PB windows keep all data in memory and do not use the disk cache, but use a separate cookie jar kept in memory, cookies from regular windows stored in cookies.sqlite in the profile folder can't be accessed. All PB mode windows share the same PB mode cookies jar, you need to close all PB windows or close and restart Firefox to start with a fresh PB cookies jar.

Well, feels like that explains why PB works. But then how to I get a consistent access to that page in normal FF? I have not been able to do that even once and I use the logins, cookies, etc in many other T-mobile sites.

OK, found a setting in my cookie blocker that allows this to work as expected now. Thanks for the help folks.