[Linux] Min Vid player doesn't move its position when trying to drag it on the screen

[SoftVision-CarmenFat]

[Affected versions]:

• Firefox Nightly 60.0a1 (2018-01-25)
• Developer Edition 59.b3
• Min-Vid 0.4.7-dev (built on 01/25/2017)

[Affected Platforms]:

• All Linux

[Prerequisites]:

• Latest Min-Vid add-on 0.4.7-dev (built on 12/19/2017) was previously installed on a clean profile.

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites and navigate to any supported platform.
2. Send a video/song to the mini player and choose to play it.
3. Click and hold the space between the "Close" button and the "Send to tab" one.
4. Move the player to a different position.
5. Observe what happens next.

[Expected result]:

• The player can be moved to any position on the screen.

[Actual result]:

• The player doesn't change its position.

[Additional notes]:

• Here is a screen recording of the issue: https://goo.gl/7istpY

[ryanleesipes]

This seems to be fixed for me.