Hi masquerain,
A new version of BullGuard (v12) will be released on 10th of October, and we are planning to implement it via an auto-upgrade after several days, depending on the feedback we'll receive. The Safe Browsing plugin works on all browser (at least on Beta 6 ).
Since Mozilla releases new versions of both Firefox and Thunderbird monthly, it is hard to keep up with all the changes, considering all the work we have invested in v12.
Firefox 7 and Thunderbird 7 were both launched yesterday. Here you can see the expected release dates for new versions: [url] https://wiki.mozilla.org/Releases [/url].
Best wishes!