Firefox only issue | Spinner boxes are hard to click

[johannest03]

Spinner boxes in following components's configuration options are hard/nearly impossible to click in Firefox (Chrome, Microsoft Edge and Opera are fine)
Firefox only problem. (Around 3.5% of users...)

• Recipe Detail
  • https://webcomponents.opendatahub.testingmachine.eu/webcomponent/32c2bef1-a691-4b93-bc41-56ecb88e39f0?from=%2Fsearch%2Fany
• Tourism Detail
  • https://webcomponents.opendatahub.testingmachine.eu/webcomponent/e6c628d4-810b-489d-b8ec-1b33c8f025c6?from=%2Fsearch%2Fany
• Weather in South Tyrol
  • https://webcomponents.opendatahub.testingmachine.eu/webcomponent/991e1fd5-8eaf-4d7b-9ca4-dea7544b6c02?from=%2Fsearch%2Fany
• Weather in South Tyrol - forecast
  • https://webcomponents.opendatahub.testingmachine.eu/webcomponent/042999d0-de5a-4907-a1e6-fcefd5e53e98?from=%2Fsearch%2Fany

Note
The mentioned spinner boxes are also present in the new version of the store.(Links to the new store)

Desktop
OS: Windows 10
Browser: Firefox ,Chrome, McE, Opera