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and really technical "what's new" for developers [simon.incutio.com]
Behind the scenes: 40 bugs still listed for 1.5 [bugzilla.mozilla.org]
You are going to make sure all your extensions are up to date for this release, it's critical.
TIP: easiest way to look at all your extensions & themes to track them for updating:
Basically I go down the list of hyperlinks the above makes and just check for current versions and/or complete changes for 1.5 support.