Bugzilla

[Affected versions]:
- 63.0b6, 64.0a1 (2018-09-09), 62.0

[Affected platforms]:
- Win10x32, Ubuntu 18.04

[Steps to reproduce]:
1. Launch Firefox;
2. Access any video on youtube.com
3. Click on the mute/unmute button for the video;
4. Press on the [Space] key on the keyboard a couple of times

[Expected result]:
- only mute/unmute or like for other browsers play/pause commands are issued

[Actual result]:
- both mute/unmute and play/pause commands are issued

[Regression range]:
- will check if it's a regression asap

[Additional notes]:
- attached recording with the issue;
- macOS not affected;

[Affected versions]:
- 63.0b6, 64.0a1 (2018-09-09), 62.0; 66.0 and 67.0a1 (2019-03-11)

[Affected platforms]:
- Win10(x32), Ubuntu 18.04, Ubuntu 16.04(x64)

[Steps to reproduce]:
1. Launch Firefox;
2. Access any video on youtube.com
3. Click on the mute/unmute button for the video;
4. Press on the [Space] key on the keyboard a couple of times

[Expected result]:
- only mute/unmute or like for other browsers play/pause commands are issued

[Actual result]:
- both mute/unmute and play/pause commands are issued

[Regression range]:
- will check if it's a regression asap

[Additional notes]:
- attached recording with the issue;
- macOS not affected;