Are you concerned whether your email has been hacked or compromised.
Use Firefoxmonitors to check for the same. In case your password has been leaked or compromised by any of the breaches it will display so.
The significance is suppose the hacker knows your password and he can use the same password to Login into your different userids, etc. I checked one of my older emails and what I observe is It was impacted by some linkedin breach.
Through this the hacker knows my password which i had used for my linkedin account.
And now if this same password is being used for my emails etc he can easily figure out my email password too since its my master password.
You can check if your email has been breached at the following link.
Followin is how you do it Go to the link provided
Provide your email ..
It displays what impact which breach imapcted you..