In order to completely remove the esnips software and toolbar, you can un-install the esnips download software from your system control panel. And, in un-install the ‘esnips downloader extension‘ if you are using Mozilla Firefox.
In order to remove the esnips search engine from your web browser, if you are using Mozilla Firefox, in the browser address bar -> type about:config and search for esnips.
And them, right click on all ‘user set‘ under the ’status’ column and click on reset (as in the following image).
Once you change the above values to default, the default search engine will be restored in your browser. To sum up, if you feel that the esnips toolbar and search engine are annoying then, uninstall the enips downloader software from your control, uninstall the esnips toolbar from your web browser and restore the enips search engine in your web browser to default.