1. when you start to search and type in a few letters, it freeze
2. if you have a business account, and you want to link your personal account to it, it only works on one kinds of browser, aka, if you link it on Edge, it's not there in Firefox, if you link it on Firefox, it's not there in other browsers
3. support team is lack of knowledge and not very helpful and seems don't care, they just ask you to reinstall the addon or browser or reboot...
4. and in Firefox addon, if you are using personal account, you can not see one time passcode field! So you can't add MFA into it, while Edge addon can do. And the support team seems do not know why.