Their comments came as Mozilla's head of engineering acknowledged that the browser's final delivery date will slip.
In a message posted to a company message forum, Firefox developer David Baron wondered how long Firefox 3.1 should be held up by TraceMonkey problems. "Without TraceMonkey, we probably could have shipped 3.1 final by now, or, if not now, within the next month," Baron said. "I think there should be a limit to the amount we're willing to slip 3.1 to accommodate TraceMonkey, and I think we should decide what that limit is."
Graydon Hoare, a Mozilla developer who works on TraceMonkey, agreed. "I have to concur here," he said in a message on the same forum thread. "TraceMonkey is really cool tech, and a remarkably quick initial development, but it's not the whole enchilada of the browser." Hoare, however, said it made more sense to disable TraceMonkey by default -- an approach used through Beta 1 -- rather than pull it from the product.
Mozilla has made much of TraceMonkey, and the performance boost it gives Firefox, since it introduced the new JavaScript engine last summer. But TraceMonkey bugs, and the slow pace in patching them, were responsible for delays last month, and for a three-week stretch this month when Mozilla put off scheduling the next preview, Beta 3.
The biggest bug now delaying Beta 3's release is a TraceMonkey issue.
But Mozilla will probably not pull the engine, said Mike Shaver, Mozilla's vice president of engineering, in an interview Saturday. "We're always looking at all of our choices, but I don't think it's likely," he said. "TraceMonkey is a big part of Firefox 3.1, and a big part of what we want to have for users."
Saying that Firefox 3.1 in its current form is "quite a stable product," Shaver said patience is a development virtue. "We're taking the time to get this worked out," he said. "No one will remember when Firefox 3.1 shipped other than the guy who writes the Wikipedia entry. But people will remember how Firefox 3.1 runs."
Comments by developers such as Baron and Hoare are in no way a "revolt" by programmers, said Shaver, who added that such discussions are normal at Mozilla, and during software development in general. "There's always talk about what we should trade off," he said.
Mozilla conceived Firefox 3.1 as a "fast-track" update to June 2008's Firefox 3.0, but the new browser's progress has been much slower than originally planned. At one point, Mozilla was shooting for a final release as early as the last months of 2008, and hinted that it would use just a single beta to do so.
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