A word of WARNING. I installed this extension thinking it could save me time by not having to look up different conversion calculators online when I need them. However, not only did the extension hijack my home page search engine, but it also displays an ad on ANY of the tabs that I have open. For example, if I refresh the page of another tab I am immediately taken to an ad. On the bottom of the ad it has this plugin developer listed as the one supporting it.