Prevent tab change on contextual "Search Google for '{selected text}'"
Solution 1:
Hold down the CTRL key when you click Search Google for ...
.
That should open the search results in a new tab without losing focus of your current tab.
Solution 2:
Google is adamant for some reason that it won't provide an option for this.
rahi has already provided a workaround but these extensions (I'm sure there are many more in the same vein) might help as well:
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Selection Search:
It provides the possibility to specify if a new tab should be opened in the background or foreground for individual search engines.
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Simple = Select + Search: