And so at last the beast fell and the unbelievers rejoiced. But all was not lost, for from the ash rose a great bird. The bird gazed down upon the unbelievers and cast fire and thunder upon them. For the beast had been reborn with its strength renewed, and the followers of Mammon cowered in horror.

from The Book of Mozilla, 7:15

The "beast" falling refers to Netscape being closed down by its now parent company AOL. The "great bird" that rises from the ash is probably the Mozilla Foundation, which was established to continue Mozilla development. The bird rises from the ash like a Phoenix — a reference to the original name of the Mozilla Firefox browser (known as Firebird at the time this verse was written). The bird casts down "fire" and "thunder" on the "unbelievers", which is a direct reference to the Mozilla Firebird (now Firefox) and Mozilla Thunderbird products, which became the main focus of Mozilla development a few months before the events of July 15.

SeaMonkey - Креветка (как правильно?)

Thunderbird - Дух в облике птицы. Некоторые называют буревестник, но я сомневаюсь в правильности такого перевода.

Sea-Monkey is a brand name of a hybrid of Artemia salina, a species of brine shrimp. These are a type of fairy shrimp—not true shrimp, but a branchiopod.