No tooltip is displayed when you hover the "Disable Sync" button

[Softvision-CristinaBadescu]

[Affected versions]:

• Firefox 58.0.2 and up

[Affected Platforms]:

• All Windows
• All Mac
• All Linux

[Prerequisites]:

• Have a Firefox profile with the latest "Firefox Notes" add-on v3.0.0dev installed.
• Be logged in a Firefox Notes Account.

[Steps to reproduce]:

1. Open Firefox browser with the profile from prerequisites.
2. Hover the "Disable Sync" button from the "Notes" three dots menu.
3. Observe the behavior.

[Expected result]:

• The "Disable Sync" tooltip is displayed.

[Actual result]:

• No tooltip is displayed.

[Notes]:

• Here is a screen recording with this issue:
  

[vladikoff]

@Natim our new contributor, will try to fix this

[Softvision-CristinaBadescu]

This issue is no longer reproducible using Firefox Notes v3.0.0dev (custom built on 2018-02-21), on latest Nightly build 60.0a1 (2018-02-20) on Windows 10 x64, Mac 10.12.6 and Arch Linux 4.12.