My Firefox add-on, WebMail Notifier, stands head and shoulders above the rest in terms of my productivity or, lack of the same if it stops working – as it did over-night. The problem was restricted to Gmail – Hotmail and Yahoo Mail were unaffected – still, what a pain!
From the: Why reinvent the wheel files – Geeks, just like everyone else, turn to Google, or….. – in the event that others have experienced the same problem and, a solution has been posted.
Long story short –
Google has initiated a number of changes in Gmail’s log-in address (which they seem to do regularly), that broke the log-in script in WebMail Notifier. Apparently, this Google rollout is taking place over several days – so, it’s possible that if a user has more than one Gmail account, one or more may be impacted, but not others.
I found a number of manual solutions to this problem – all of which worked. However, if you are currently dealing with this issue – you can avoid all the hassle by simply downloading version 2.9.11 of WebNotifier, which corrects the problem.
Download at: WebMail Notifier
Kudos to the add-on developer for jumping on this quickly – again.

thanks but version 2.9.11 initially worked fine for about 5 days before it failed again to detect any of my gmail accounts. Have tried uninstall and reinstall but to no avail. Any advice please?
I concur, the fix initially worked but has ceased to work correctly for gmail. How do I fix this?
Hey Mike,
Drop by the developer’s site and downloaded the latest. Had to do that again this week.
Best,
Bill