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Mozilla foundation said that they are still in schedule to release Firefox 3.5 Beta 4 this week even though they do not mentioned the fixed date of the release.

Mozilla Firefox 3,5 Beta 4 will be the last test version before Mozilla release the candidates of Firefox 3.5 version. However, Mozilla failed in qualifying Firefox 3.5. This early year Mozilla delayed to release Beta 3 twice before moved into Beta 4, and eliminated name of Firefox 3.1 for Firefox 3.5 that reflected significant difference between version 3.0 and 3.5.

Most of the previous delay was around the Firefox new JavaScript, TraceMonkey, which is promise to accelerate pages display two times quicker from Firefox 3.0 and nine times quicker from Firefox 2.0. At this time, Beta 4 loads seven high priority mistakes that need reparation, and five of them are involving JavaScript engine.