Hi Chris,
event_mask in fop2.cfg is commented by default. It is there only for really big setups where you have too many manager events. But if you use asterisk 1.8 is much better to use eventfilter in manager.conf than the event_mask setting, as it is much more granular (event_mask as it should be from the start).
So there is no problem leaving that commented, if you want to reduce manager load with asterisk 1.8 and above, look at this blog post:
http://www.fop2.com/blog/make-fop2-snap ... ventfilter
Regarding the Chrome extensions, it does not support panel contexts yet. I will add support for it for the next release.
Best regards,