Add search text to your splunk search query over the right click menu, then open splunk in a new tab.
The plugin extends your context menu, where you add search text to look for in your splunk web gui.
The url to your splunk web gui must be configured in the options menu of the extension.
In the options menu you can define the default timespan to search in as well.
The plugin tries to convert the selected text in a date(time) and creates the appropriate timeslot as parameter for the splunk search.