Here my experiences with Mozilla, Chrome and Opera so far:
Mozilla: v1.2 reviewed, signed and published within an hour and got a 'Thank you for your contribution' Email from
the Reviewer; Mozillas Review Process is the best experience so far and the Dashboard is of high quality.
Chrome: v1.1 Public published; 100% identical v1.1 Unlisted Taken Down?
v1.2 Public Update wating for days now; v1.2 Unlisted Update Taken Down and in manual Review for days now?!
Also no Emails why one was Taken Down while the other identical one wasn't. No Email with any confirmations,
No Emails at all, the Google Developer Dashboard is like a Lottery-RNG-Blackbox ... very frustrating!
Also their Dashboard has the lowest quality of all so far. And it took tons of tickets to even get that v1.1
published ... utter most frustrating!
Opera: v1.2 submitted 7 Hours ago, nothing happens, no queue like on mozilla, almost same blackbox as Googles Dashboard
but at least of better quality, still below mozillas but definitely better than Googles.
And that Extension/Addon is so small and easy a child could review it in 30 seconds.
It's also open source on Github i even provided the Link to the Repo as support and open source link.