If you are using it and notice problems, it's best to either let us know at greasemonkey-dev or log an issue (and be clear that it's with this version).
- Work around for a problem Tab Mix Plus causes when opening links in new tabs. (#1406)
Greasemonkey is a Firefox extension that allows you to customize the way webpages look and function.
Hundreds of scripts are already available for free. And if you're the tinkerer sort, you can also write your own.