"Firefox Notes" toolbar button does not work at all after the sidebar is closed in another window

[Softvision-MariusComan]

[Affected versions]:

• Firefox 57.0.4 and up

[Affected Platforms]:

• All Windows
• All Mac
• All Linux

[Prerequisites]:

• Have a Firefox profile with the latest version of the "Firefox Notes" add-on (2.2.0dev custom build from 01.08.2018) installed.
• Have the "Firefox Notes" sidebar opened.

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites and press "Ctrl+N".
2. Click the "Firefox Notes" button from the toolbar.
3. Focus the other window and click the "Firefox Notes" button from the toolbar.
4. Observe the behavior.

[Expected result]:

• The sidebar is closed.

[Actual result]:

• Nothing happens, the sidebar remains opened.

[Notes]:

• After step 3 if the sidebar is closed/switched, then the issue is no longer reproducible.
• The button will no longer work if the sidebar starts closed, a new window is opened, the sidebar is opened in the second window and you switch back to the first window.
• Attached a screen recording of the issue:
  

[johngruen]

This is blocked until 59

[Natim]

We should probably use the toogle feature here.

[Natim]

In the meantime, we should probably broadcast the signal to all sidebars to close when one receive the signal.

[Natim]

I opened https://bugzilla.mozilla.org/show_bug.cgi?id=1429054

[Softvision-MariusComan]

The issue is no longer reproducible with the latest version of the "Firefox Notes" add-on (2.2.0dev custom build from 01.16.2018) installed, on the latest Firefox release and Nightly.