Rated 5 out of 5 stars

UNMISSABLE !!! besides, in firefox, you can assign a keyword to each serch engine (I assigne the keyword 'pl' to this perldoc search engne).
So, when I want quickly search something in perldoc (e.g. description of 'grep' function), I simply go in the address bar (with CTRL + L) and digit 'pl grep' and press ENTER .
Et voilà !!! the perldoc page describing 'grep' opens in front of me.

Even more useful is the CPAN search engine for Firefox (in fact perldoc is accessible from many IDE, while CPAN not): I assigned the keyword 'cp' to it, then in the address bar I digit 'cp dbi' and the page of the DBI module opens ..... fantastic