Unclear from UI how "keys to exclude" should be separated (if at all)

[phlummox]

Describe the bug

In the extension settings, under "Excluded URLs and keys" / "Keys to exclude", it is not clear whether the "keys to exclude" should be separated by commas, whitespace, something else, or nothing at all.

Apparently, the answer is "nothing at all", but that's fairly unusual for a UI.

To Reproduce

View the extension options.

Browser and Vimium version

• Browser: Vivaldi 7.0.3495.6 stable (64-bit)
• OS: Linux
• Vimium version: 2.1.2

Comments

It would be helpful if the UI said exactly what separators are permitted (e.g. "the keys may, optionally, be separated by whitespace") as well as what's normally expected (e.g. "the keys should be a single string - e.g. fgh").