Clicking the "Play" button and the progress bar while the video is playing generate pings with similar event and method strings

[SoftVision-CarmenFat]

[Affected versions]:

• Firefox Developer Edition 59.0b7
• Firefox Nightly 60.0a1 (02/09/2018)
• Min-Vid Shield Study Onboarding 0.4.7 - Shield Study

[Affected Platforms]:

• All Windows

[Prerequisites]:

• Latest Min-Vid v.0.4.7 Shield Study Onboarding ("active" or "activeAndOnboarding" variant) was previously installed on a clean profile.

[Steps to reproduce]:

1. Open the browser with the profiles from prerequisites and navigate to YouTube.
2. Send a video to the player.
3. Click the progress bar.
4. Go to "about:telemetry" and observe the event and method of the generated ping.
5. Click the "Pause" and then the "Play" button.
6. Go to "about:telemetry" and observe the event and method of the ping generated by the "Play" action.

[Expected result]: 4&6. The strings for both events and methods should be different so that this doesn't lead to erroneous metrics results.

[Actual result]:

4. "player_view" event and "play" method are displayed.
5. "player_view" event and "play" method are displayed.

[Notes]:

• When the player is paused, there is no ping generated when clicking the progress bar.
• Here is a screen recording of the issue: