Cell borders not visible when applying cell background color in Firefox

[FilipTokarski]

📝 Provide detailed reproduction steps (if any)

1. Use Firefox
2. Go to full featured editor sample
3. Add a table
4. Select few cells
5. Add background color

✔️ Expected result

Cell borders are sill visible:

❌ Actual result

Cell borders are not visible:

📃 Other details

• Browser: Firefox
• First affected CKEditor version: Seems to be an old issue

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[CKEditorBot]

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[CKEditorBot]

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