QwickUp is a Firefox addon that features the most popular lookup services (translate, dictionary, Wikipedia, etc).Simply select some text in a web page and click on QwickUp icon to open results in a popup or new tab.

This Extension displays a drop-down menu with all Opera internal pages : - about:blank- opera:about- opera:config- opera:plugins- opera:drives- opera:history- opera:historysearch- opera:help- opera:cache- opera:debug- opera:memdebug- opera:webstorage- opera:webdatabases