Several errors are displayed in browser console when clicking the Lockbox toolbar button

[SoftVision-CosminMuntean]

[Affected Versions]:

• Lockbox 2.1.0-alpha
• Firefox 67 and up

[Affected Platforms]

• All Windows
• All Mac
• All Linux

[Perquisites]

• Have the latest Firefox 67 version installed.
• Have a Firefox profile with the "xpinstall.signatures.dev-root" pref created and set to "true".
• Have the Lockbox 2.1.0 - alpha extension installed.

[Steps to reproduce]:

1. Open the Firefox browser with the profile from prerequisites.
2. Click on the Lockbox toolbar button.
3. Observe the browser console.

[Expected results]:

• No Lockbox errors are displayed.

[Actual results]:

• "tab is undefined" and "Failed prop type: The prop hasProfileNeedsAttn is marked as required in SyncNotification, but its value is null." errors are displayed.

[Notes]:

• Attached a screenshot with browser console:

• Attached a screen recording with the issue: