This is a Cinnamon applet, which adds a Web Search box to your Cinnamon panel.
Left-clicking the item will open a search box where you can enter your criteria. You can right-click the applet to access additional settings - show or hide the provider label, change provider
1) Unzip, copy the folder "search-box@mtwebster" to "~/.local/share/cinnamon/applets/". 2) Enable the applet in cinnamon settings.