Could be a godsend but... Rated 4 out of 5 stars
I installed this because I cannot live without the Google highlighter - however, following a reinstall recently (1) the highlighter no longer toggles* on/off when the icon is clicked, I have to refresh the page (a minor nuisance), and (2) although I've set Google.co.uk as the search site I get American results (a major nuisance). I'm sure these failings will be fixed eventually and then it will be a 5-star add-on. It's very neat 'n tidy.
*Yes it does, depending on site, so one star added on.
Make sure you have the "Use secure search where possible" option disabled, and the .co.uk searches should work. It used to be that Google only offered secure search at the .com address, so I force all secure traffic through that location. I see that they have changed their policy on that, so I will make this change in the next release.