Is there a method (way) to turn off the Pop Up Box as I move the cursor over email sender's id as I browse emails? I suffer headaches from flashing objects (like blinking red lights) in one or two seconds. As I review the emails I must often stop and recover.
You can install the following Userscript to disable the pop-ups. There is no default option to disable them, so this is really the only way.
Using this will disable all the pop-ups for the username.