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After several attempts at loading different apps from the directories they're in, I keep getting File not found errors, probably because of a missing directory inside ~/Library/Caches/TemporaryItems/b2g/ (c.f. screenshot below).
Please let me know if this is a known bug or if there is any way I can provide you more with more details about the error.
Firefox Nightly build: 26.0a1 (2013-08-15)
Firefox OS Simulator: 5.0pre3 (was broken in 4.0 too)