X-notifier ruins google's settings somehow, affected google maps

Google recently pushed the new google maps, but you can retrun to the old version (and remember). However, X-notifier will prevent this setting to work.

To repo this problem, first you need to install x-notifier, and set up a gmail account and don't modify any default settings (because I only repo'd the problem with default setttings).

After that, open google maps: http://maps.google.com/

If it showes the new google maps,  click the right bottom question mark, and select "Return to classasic google maps".

It will ask "You have switched back to classic Google Maps for this session. Remember this choice for next time?" Click "yes".

Close firefox entirely. Then restart.

Open google maps again,the problem happened: it's still showing the new google maps! Despite that you have set that "I wanna the classic one". If it doesn't happen, close and restart Firefox again. For me it will always happen after up to twice restarting.

If you disable your google account in x-notifier or the add-on itself, this problem suddenly resolved. It takes me sometime to figure out it's this add-on to cause this problem..