DropBox Sign-in Issue

To me dropbox paper is essential ... is the best for ideas, projects, todos, collaborate and share, etc... please any help is welcome.

Hoping to give more info...

Same problem of not being able to get to chrome and firefox to pass signin (It only shows small banner message at the top that I'm signed in and that it will be shortly redirected but nothing happens and the small banner disappears)...

I was able to recreate the problem with edge (I was able to signin using my google signin with edge properly and see my documents but then) ... then I tried to install my favorite extensions old-time favorites' and it happened when installing chrome extension NINJA-COOKIE ...

Update ... using brave browser with the same extension gives me no problem ...

I have tried the following:

looked dropbox seemed working on https://downdetector.com/status/dropbox/

no proxys and no vpns, standard automatic DNS with no adblocking.

disabling all extensions

removing all extensions

using incognito

using a new clean slate chrome profile

reinstalling chrome

removing all profiles, going to chrome settings to remove all cache and site data, uninstalling and installing, (including) deleting AppData files, program files and registry items, and reinstalling with new clean profile

but the problem persist ... I am really terrified of having to format all my computer because of perhaps a malfunctioning "ninja-cookie" chrome extension that didn't have problems before dropbox internal modifications on July 21th, 2021. (not blaming, its just that that is when this problem appeared first to me if It's anybody's fault is mine for using the extension)

I even tried an old slow laptop. I opened  dropbox site as usual and logged in without problems but when I restarted for some other reason dropbox.com site stopped letting me in (perhaps chrome updated something internally).

Please any advise is welcome !!!