Rated 5 out of 5 stars

Idea: Group Keyword
Each engine now have two keyword: Keyword and Group Keyword.
For example:
engine / keyword / G. keyword
google.com / g / t
translate.google.com / gt / t
bing.com / b /
yahoo.com / y /
babelfish.yahoo.com / yt / t

Then use b g y or something for single search, use t to open multiple result pages. Here, with @t c'est la vie you'll get three result tabs. This is called multi-Search

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