A very baisc extension which add to contextual menu popping up on right click, the option WP2Objectivepedia ! whenever your on a Wikipedia page. Clicking this option opens a tab on Objectivepedia on the corresponding article.
Moreover, it adds to this same menu the option Objectivepedia this ! which appears even if your not on a Wikipedia page, on condition that some text is currently selected. Clicking this option opens a tab on Objectivepedia and start a search whith word(s) of the selected text.