A flicker is displayed on the product's section when re-adding it to the Price Wise list

[SoftVision-CarmenFat]

[Affected versions]:

• Firefox Release v63.0.1 and up

[Affected Platforms]:

• All Windows
• All Linux
• All Mac

[Prerequisites]:

• Have a Firefox profile with the latest version of the "Price Wise" add-on (10.0.0) downloaded from (download link).
• Have a product added to the list.

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites.
2. Click the "Price Wise" toolbar button.
3. Hover the product's section and click the "Delete" button.
4. Click the "Undo Delete" button and observe the product's section.

[Expected result]:

• The product is added again on the list, without any visual defects.

[Actual result]:

• The product is added again on the list, but a flicker is displayed on the product's section.

[Notes]:

• Here is a screen recording of the issue: