One issue with Dev Edition is that it shares the base code with Beta. With the new 4-weeks release cycle, most of QA testing now happens in Beta, meaning the ch

One issue with Dev Edition is that it shares the base code with Beta. With the new 4-weeks release cycle, most of QA testing now happens in Beta, meaning the chances of serious bugs in Beta and Dev Edition increased quite a lot. Previously, most of the testing happened in Nightly, and only tested code was moved to Beta and Dev Edition.