Sign in browser based method not working

I am using latest version of Teamviewer 13 inside Ubuntu 16.04 32 bit OS. I clicked sign in option in the app. It opens my default browser Firefox with a blank windows. Now I open dropbox site and sign in. It shows my files inside browser but desktop app fails to recognize browser sign in information. 

I tried switching to old app which had sign in info. to be entered inside app itself, but it says, 'version of dropbox is too old, please use a newer version'.

so end of the day, because of such buggy app, I am unable to use dropbox.

All the solutions given on internet are not working. Dropbox support team has no clue of what it to be done. Its sad. Thanks.