Mozilla unveils Firefox 3.5 Release Candidate

Saying that it still plans to launch Firefox 3.5 by the end of the month, Mozilla late Friday issued the new browser's first release candidate, the most stable and polished build delivered so far in the year-long development process.

Firefox 3.5 Release Candidate (RC) was the first milestone since Beta 4, which Mozilla released in late April, and the second to carry the "3.5" label. The upgrade was originally called Firefox 3.1, but the company decided in March that it had added enough new features to justify the larger bump in number from last summer's Firefox 3.0.

Mozilla has had to delay Firefox 3.5 RC several times because of lingering bugs that defied fixing. Earlier plans had envisioned its release in the first week of June.

In fact, Mozilla took a pair of unusual steps this month as it neared Friday's delivery of Firefox 3.5 RC. It issued an interim build two weeks ago that it described as a nearly-finished RC, but offered the "Preview" only to the 800,000 daily users of Beta 4.

Last week, it repeated the move by pushing another update to the same 800,000.

"As soon as QA performs basic...tests on the milestone, we'll ship the partial updates to our existing beta-channel users," explained Mike Beltzner, the director of Firefox, in a message posted to a Mozilla developer forum on Wednesday. "Then, while our quality assurance team finishes more in-depth functional testing, our large beta audience will be helping us by using the builds across the breadth of the Web. We'll get wider feedback earlier, giving us even more confidence before we declare a milestone as final."

Mozilla issued the first such build last Tuesday, calling it "rc1build2," said Beltzner, because it was "the first revision of the release candidate for which we'll ship updates, and it required two build attempts,"

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