Hi, and thanks for reaching out.
When several versions are waiting, the reviewer always reviews the latest one, so shipping a new version doesn’t leave the Firefox release stuck behind an older pending version.
That said, I’m sorry I can’t promise specific review times. We have been seeing a large influx of new submissions, which has stretched the queue. We wrote about what is happening and what we are doing about it here: Important update: Addressing the long manual review times ( Important update: Addressing the long manual review times ).
In the last review, the reviewer raised some issues. Have you addressed those in the new version?
Thank you!
-Christos