You may not want to use an extension to get Google Scholar results. Here is a really simple bookmarklet that does the following:
– Click it when you are browsing a scientific paper and it reloads the page with the Google Scholar search results
– Click it again on the Google Scholar page to go back to the paper (if you haven’t navigated elsewhere)
Simply drag this link: GScholar to your bookmarks bar. It will work for most papers to do a quick search.