Removing a corporate Gmail account from thunderbird

I used to have a corporate Gmail account but a colleague has taken it over and changed the password I removed it from my thunderbird win10 app by selecting it and deleting it in the normal way and all the folders have gone But every time I launch the app on my pc it asks me for a password for the deleted account, then launches a chrome browser page and asks me to log in to my colleague's Google account I've tried deleting thunderbird and reinstalling but this still happens, as though the account details including the deleted one are still stored somewhere on the PC. I have 4 personal email accounts and I use the unified folder facility Can you help?