Add custom search to SearchBar

Options/Help
Button preview:
Description
Hotkey
(press cross to remove) 
Home page URL
Search URL
with %s in place of query
Icon URI
New tab hotkey
background tab
New tab hotkey
foreground tab
SearchBar was unable to detect the settings for this custom search.
Please wait for the page to finish loading and try again.
SearchBar was unable to detect the settings for this custom search.
It may still be possible to add this custom search manually via the options page.