I find two of the most repeated tasks during my workday are looking up JIRA tickets and contractor emails. I created this Chrome extension to allow me to quick open a JIRA ticket by the key.
I also work with a number of contractors who have internal and external email addresses and Teams generally only shows the internal account which is not monitor by the user. I added a section (accessed by clicking the clipboard icon) to the list where I can one-click copy the user's email address for use in Teams and Outlook. I have since expanded it's use for other values I reference frequent (e.g. project codes, cost centre IDs). Anything I add to the list can be copied to the clipboard simply by clicking on it.