Microphone button is wrongly displayed outside the search input on Nightly

[SoftVision-CarmenFat]

[Affected versions]:

• Nightly 56.0a1

[Affected Platforms]:

• All Windows
• All Mac
• All Linux

[Prerequisites]:

• Have a Firefox profile with the latest Voice Fill version (1.0 -dev, built on 05/07/2017) installed.

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites.
2. Navigate to https://duckduckgo.com/
3. Observe the way the microphone button is displayed.

[Expected result]:

• The microphone button is displayed inside the search input.

[Actual results]:

• The microphone button is displayed outside the search input, in different places of the website's content area.

[Notes]:

• On http://www.ebay.com/ the microphone button is not visible nor reachable because the website's notification overlaps it.
• This is also reproducible on the following websites:

1. http://www.bing.com/ - microphone button is displayed on the bottom left of the screen
2. https://www.google.com - microphone button is displayed on the top left of the screen
3. https://www.apple.com/ - microphone button is displayed on the bottom left of the screen

• Here is a screen recording with the issue:

[clouserw]

This is not a launch feature. For launch, we are only targeting about:home, about:newtab, and context menus.

[mrstegeman]

This no longer seems to be an issue.