Quickly search the highlighted text in Slack via the right-click context menu.
This extension is really lightweight and simple to use following this three step process:
1) Highlight some text
3) Select "Xendo > Search in Slack"
The results will show-up in a sidebar that slides out from the right, so you won't lose the place where you're working. Get full-text search and also OCR (Optical Character Recognition) to search scanned attachments.
The search piece is provided by Xendo. You can find out more at http://xen.do or get help at firstname.lastname@example.org.