Subsequent to making Facebook Developer Forum as read-only, Facebook team has made the bug reporting tool Bugzilla read-only today.
For new bugs, they should now be reported to the new bug tracking system at https://developers.facebook.com/bugs.
While this tool is new, probably we will find bugs or get suggestions on how to improve it further. Having said that, I like this tool!
And just in case you get new findings or additional that want to add/discuss for existing bug reports in Bugzilla, simply a new bug report in the new bug tool AND at the same time, remember to make references to the existing bug report in the new bug report. This will help the team and others to know better about the history of the problem.