Thread:Extension talk:GoogleSiteSearch/How to make search results open in same window?/reply (2)

OK, I've managed to solve it.

Edit the GoogleSiteSearch.content.default.html

Change the line: customSearchControl.setLinkTarget(google.search.Search.FILTERED_CSE_RESULTSET);

To: customSearchControl.setLinkTarget(google.search.Search.LINK_TARGET_SELF);