Mozilla is on track to ship Firefox 3.7 alpha 5 this week, likely on Friday. Of course, as with all releases, there’s a chance the release date will slip, but the release is currently on track.

Firefox 3.7 alpha 5 – which has yet to be rebranded Firefox 4 – will include several new features over the previous alpha, mostly on the backend.

• WebM support
• ChromeWorker with jsctypes
• 64-bit Mac and Linux builds
• Cocoa NPAPI support (improved performance with Flash 10.1)
• New Add-ons Manager (draft UI)

Candidate builds for the alpha will be started shortly and we’ll have a blog post once Mozilla announces the release.

Update: Candidate builds are now available.