Rated 2 out of 5 stars

Has potential, but this addon's options is one large bug.
By only configuring this addon I have found nearly 10 different bugs/usability issues: it deleted all my "services" from the list by itself (even after I pressed "Cancel" it didn't help), cannot add the same "provider" more than once for most, imports more providers than i have, fails to add new service saying that I have with the same name when i don't, defaults to "disabled", hard to use and understand, even if i just want to use the same providers from FX search-box i need to spend a hour to configure it first (and again after it deletes them all), etc....
Also, making the search engines appear without the need going to the context menu is a GOOD idea - see "Universal Search" add-in.
Option to open a search in "foreground tab" would be good too.
The good thing is that you can configure the search URLs and search more than one at a time.

This review is for a previous version of the add-on (0.4.3).