Broken updater for Mac Nightly builds
Nick Thomas 
There was some accidental breakage in the Mac builds of Nightly last Friday (Sept 16th), which results in a crash when you try to update your build. The revisions & buildIDs for the broken builds are
- 39b192706927, 20110916030907
- f4d78560721a, 20110916071142
You can check what you have by loading about:buildconfig, or evaluating navigator.buildID in the Web Console.
The solution is to download the latest Nightly build from http://nightly.mozilla.org.
Applications like Thunderbird and SeaMonkey are probably also affected.
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[...] a queue from Nick Thomas (Post), and as he so deftly notes. This breakage is also for SeaMonkey. To quote him (while replacing [...]