The "Undo Delete" functionality is automatically performed if a product is deleted while its page is loading

[Softvision-RemusDranca]

[Affected versions]:

• Firefox Release 63.0.3 and above

[Affected Platforms]:

• All Windows
• All Mac
• All Linux

[Prerequisites]:

• Have a new Firefox profile with the latest version of "Price Wise" (18.0.0) installed.
• Have a product added to the "Products list".

[Steps to reproduce]:

1. Open the browser with the profile from prerequisites.
2. Open the product's page from prerequisites.
3. While the product's page is loading click the "Price Wise" toolbar button, hover over the product section and click the "Delete" button.
4. Observe the behavior.

[Expected result]:

• The product is deleted and the "Undo Delete" option is displayed.

[Actual result]:

• The "Undo Delete" option is briefly displayed after delete and the product is automatically re-added to the list.

[Notes]:

• This issue is also reproducible with the TP version of "Price Wise" experiment.
• Attached is a screen recording of the issue: