Yes, the error was: nsGMailPOP.js: loginHandler : Exception : Error. Error message: Invalid Password 264
I logged out of gmail via browser and, when I logged back in, I noticed that it was asking me for a phone number in case I needed to reset my password. I entered a phone number and, after that, the gmail webmail addon started working again. So the problem occurred because the login procedure didn't redirect the user to the inbox, it showed that "phone number" page instead. The issue is solved. Thank you for your continued support of this invaluable addon !
