Unused search buttons in omnibox not really invisible

[NebelNidas]

Description
When Mozilla basically merged the URL bar with the search bar, they added the search engine buttons on the bottom. But they did it poorly - exactly like in the original search bar!
Cause there isn't a new button added for every new engine, the buttons are already there. For us users to not notice they made them invisible, but with a poor technique. If you have Add-Ons like GMF installed (as mentioned in #904 ), these buttons will become visible. Not really nice from a UX point of view.

To Reproduce
Steps to reproduce the behavior:

1. Install GMF (caa:addon/glassmyfox)
2. Check the "Buttons" checkbox
3. Type something in the omnibox or search box

Expected behavior
These buttons should either be completely invisible or only be created when really needed.

Screenshots
Omnibox:

Search Box:

Desktop:

• OS: Win7 x64
• All Versions, I guess

Footnote
Just a small cosmetic flaw, but hey.

[laniakea64]

Does adding this to userChrome.css help? -

.searchbar-engine-one-off-item.dummy {
  visibility: hidden !important;
}

[NebelNidas]

Yes, this works! Thanks! :D
However, I do think this should be set as default. Maybe Alex could implement it in the next release? Or would this break something with some other Add-On?