The "Delete" icon looks disproportionate on Firefox 67

[SoftVision-CosminMuntean]

[Regression]:

• This is a Firefox issue since it is no longer reproducible with the latest Firefox Beta 68 build and the latest Nightly 69.0a1 build.
• Based on this, using mozregression tools I have obtained a pushlog that contains the fix for this issue. Unfortunately, I haven't managed to go further because of some mozregression errors, but here is the obtain pushlog.
• After looking over the fixes from the pushlog, I suspect that the Bug 1524901 fixed this issue.

[Affected Versions]:

• Lockwise 2.2.3-alpha
• Firefox 67.0 and 67.0.1

[Affected Platforms]

• All Windows
• All Mac
• All Linux

[Perquisites]

• Have the latest Firefox 67 version installed.
• Have the Lockwise 2.2.2 - alpha extension installed.
• Have at least on login saved.

[Steps to reproduce]:

1. Open the Firefox browser with the profile from prerequisites.
2. Click the "Lockwise" toolbar button and click the "Open Lockwise" button from the doorhanger.
3. Click one of the saved logins from the list.
4. Observe the "Delete" icon.

[Expected results]:

• The icon is correctly displayed.

[Actual results]:

• The "Delete" icon looks disproportionate.

[Notes]:

• The issue is not reproducible with older versions of Lockwise add-on.
• Attached a screenshot of the issue: