Add ability to search multiple terms, not only highlighted text.

[upgradeQ]

I guess it should be under context menu where you can add terms. For example, you want to search apples, you highlight it and add bananas, pears to single or group search, at the end, it will open 3 tabs with search engine or more if you selected group search.

[upgradeQ]

to clarify, have a look at this extension ( it useless cause you can't change default engine )