Im just saying make it more clear to other people they are getting developer builds, no matter your own experience. Nightly builds are not Alphas or Betas or anything but nightly builds. Alphas and Betas, are milestone builds. Nightly builds are called so because they are the "build of the day/night", and new code is checked-in (added to the program) almost every day/night. When getting ready for milestone release the code tree is frozen. This means that no new code can be added. It is then tested and if nothing bad or unexpected is found it is released as a milestone build (i.e. bug checking and QA). But I understand what you mean when you said the Trunk is in Beta. I agree the Trunk is far ahead in it's development and as such stable, however the daily check-in of new code still makes it vulnerable to new bugs. But being so far in the development most of the new bugs you see now are much more "benign" then what you might see in early development. And on the flip side, it can be said that any new code which do not bring a new bug should only bring some improvement and as such much good can be said for developer builds as well. Personally i do think it's worth it but some precaution should be taken. At least that you know about it and realize the possible problems you might see. You might also want to take some precaution, like backing up profile data and such. Which brings me back to the profile sharing, most people will end up running the Trunk on their Firefox 2.x profile, this is why i mention it. Not sure how far they are in the work of migration, some profile bugs have been fixed now but i still think running the Trunk on a 2.x profile can brake some profile related stuff. So again, maybe you should mention this in your first post. Also can i ask why you need to disable the extensions.checkUpdateSecurity check ?