Problem description: in case if user tries to test a script item (or any other item type for which "Host address" is disabled in Test item form), then after pressing the "Get value" or "Get value and test" focus is moved to the item configuration form, as it cannot focus on the disabled "Host address" field:

!!!NOTE: The issue is only observed in Firefox browser, and is also actual for LLD rules and item prototypes.

Steps to reproduce:

1. Open configuration of any Script item, LLD rule or item prototype.
2. Press "Test" button
3. Using keyboard naviagtion move focus to the "Get value" button
4. Press enter
5. Press "Tab" a couple of times to check where is the focus

Result: The focus is on the item configuration dialog.
Expected: The focus should remain in the "Item test" dialog.