[Steps to reproduce:]
- Open Firefox.
- In the address bar type an Intervention trigger keyword: e.g. update firefox
- Once the intervention is triggered press "Tab" to select the Intervention.
- Press again "Tab" to select the "?" Get help button.
3.+4. The keyboard selection has two borders. check screenshot
Not entirely sure what the expected result should be here, but it looks a bit weird with the double border selection.
TBH, I'd probably opt-in for an alightment for the same keyboard selection as in the case of the one off's buttons & the setting button, unless especially intended to be different for some reason.
This issue is not applicable to Search Tips, since Search Tips are focused by default and cannot be selected by keyboard.