The "Replay" button wrongly generates a "play" method

[Softvision-CristinaBadescu]

[Affected versions]:

• Firefox Developer Edition 59.0b9
• Firefox Nightly 60.0a1 (02/15/2018)
• 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.

There are two scenarios to reproduce this issue:
Scenario 1:

[Steps to reproduce]:

1. Open the browser with the profiles from prerequisites and navigate to YouTube.
2. Send a video to the player and wait for it to end.
3. Click the "Replay" button.
4. Go to "about:telemetry" and observe the event and method of the ping generated by the "Replay" action.

[Expected result]:

• "replay_view" event and "replay" method are displayed.

[Actual result]:

• "player_view" event and "play" method are displayed.
• "replay_view" event and "replay" method are displayed.

Scenario 2:
[Steps to reproduce]:

1. Perform the same steps as above (except step 4).
2. Click the "Mute" button.
3. Access the "about:telemetry" page and observe the event and method of the ping generated by the "Mute" action.

[Expected result]:

• "player_view" event and "mute" method are displayed.

[Actual result]:

• "player_view" event and "mute" method are displayed.
• "player_view" event and "play" method are displayed.

[Notes]:

• For Scenario 2, this issue is also reproducible for "Unmute", "Close", "Send to tab", "Minimize" and "Maximize" buttons.
• Here is a screen recording of the issue: https://goo.gl/P4pScC