automatic email check for comcast not working

hello

running firefox 45 and xnotifier 3.5.19

problem xnotifier will automatically periodically check my gmail and yahoo email account, and if there are new emails will open additional firefox windows for each one.

however, my comcast email will not be checked. i can however, right click on the xnotifier icon which shows a drop down menu listing all the email accts-although "comcast" is greyed out; i will then click on it and a new window showing my comcast email page will open.

so

where can i find an updated comcast script which will check comcast?