Don't you hate the fact that it's so easy for other people to see how much (or how little) you're making on MTurk? All they have to do is see any loaded MTurk page, especially the Dashboard.
This script allows you to quickly toggle the visibility of the income-related elements on any MTurk page by simply Ctrl-clicking on just about any blank area on the page. This script will also hide your ID number.
You can set the script to automatically hide these elements on page load. Simply edit the script, and set the hideDefault variable to true:
// set default value for hiding var hideDefault = false
Then, save the script. Personally, I find it kind of annoying, but you can do it if needed.
NOTE: If you still see these elements appear for a brief moment before being hidden, go to your Greasemonkey or Tampermonkey interface and set the script to be the first script to load (or maybe just loaded sooner than it's currently loading). What is happening is that other scripts are causing a delay, so setting this script to run first, or sooner, will fix the issue.