Bugzilla

This patch collects telemetry, so here is the data review form.

This patch collects telemetry, so here is the data review form.
(ed: whoops, it didn't render inline. I'll copy here for convenience:)

# Request for data collection review form

1) What questions will you answer with this data?
What buttons on the MacBook Pro Touch Bar are used most often?

2) Why does Mozilla need to answer these questions?  Are there benefits for users? Do we need this information to address product or business requirements?
Determine what inputs should be placed in the Touch Bar to maximize the benefit to users of Firefox's Touch Bar functionality.

3) What alternative methods did you consider to answer these questions? Why were they not sufficient?
We could determine what users have Touch Bars then measure if their engagement with Firefox changes based on different Touch Bar layouts.
This is very imprecise, seeing as overall engagement with the Touch Bar might be quite low, and Touch Bar layout is likely to have a low impact on overall Firefox engagement.

4) Can current instrumentation answer these questions?
No. The Touch Bar is an entirely new component and we do not currently have any tools to measure it.

5) List all proposed measurements and indicate the category of data collection for each measurement, using the Firefox [data collection categories](https://wiki.mozilla.org/Firefox/Data_Collection) on the Mozilla wiki.

<table>
  <tr>
    <td>Measurement Description</td>
    <td>Data Collection Category</td>
    <td>Tracking Bug #</td>
  </tr>
  <tr>
    <td>Using a histogram, count the number of times a labeled button on the Touch Bar is pressed (e.g. "New Tab" pressed 45 times, "Share" pressed 3 times).</td>
    <td>Interaction data</td>
    <td>1313429</td>
  </tr>
</table>

6) How long will this data be collected?  Choose one of the following:
I want to collect this data until the release of version 71 (about 8.5 months).

7) What populations will you measure?
Any users with a MacBook Pro with Touch Bar, in all countries and locales.
Measurement will start in Nightly and continue through Beta into Release as the Touch Bar feature matures.

8) If this data collection is default on, what is the opt-out mechanism for users?
If users blank out the ui.touchbar.layout preference, no buttons will appear on the Touch Bar and thus there will be nothing to measure.

9) Please provide a general description of how you will analyze this data.
We will look at which Touch Bar inputs are pressed most often in A/B experiments on the layout.
For instance, is the Share button pressed more often when it is on the left side of the Touch Bar versus the right side?
We will determine what buttons are the most or lesat popular based on the number of times they are pressed.

10) Where do you intend to share the results of your analysis?
Internally, with those working on the Touch Bar feature. The UX team might also review the data if they request it.