Those look good based on apps I have worked on but that data wasn't open so 
I'll avoid specifics. 
The crashes-per-device is surprisingly good, anecdotally I have heard targets 
of 1% or better being ideal. 
Per-session crashes is lower than any app I have worked on; I think a 
contributing factor is that some crashes are in the web view process (which 
doesn't crash the app yay!). Do we have telemetry on web view process crashes?

> On Aug 10, 2017, at 8:43 AM, Stefan Arentz <> wrote:
> Hi everyone,
> We are going to establish a baseline crash ratio for Firefox for iOS.
> We currently have two good crash ratio metrics on iTunes Connect: Crashes per 
> Sessions and Crashes per Active Devices
> The current numbers for August 7 for Firefox 8.1.1 are as follows:
>   - 909 Crashes / 824,091 Sessions = 0.0011 (0.11%)
>   - 909 Crashes / 131,074 Active Devices = 0.0069 (0.69%)
> (For a 21% opt-in rate)
> We will use these numbers as a baseline, but I would like to understand 
> better what a good acceptable ratio is for a non trivial iOS application.
> Has anyone in this group ever used a crash ratio as a metric before? If so, 
> what were your guidelines?
>  S.
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