This is a private, but publicly available collection of userstyles I've created for use with Stylish.
In order for these to work, you need to have Stylish installed.
In addition, you need to go to about:config and add my domain (mummila.net) as one of
extensions.stylish.install.allowedDomains - the separator used by Stylish seems to be space, so after
doing this the value should be "userstyles.org mummila.net" (without the quotation marks, and assuming you still want to be
able to install scripts from userstyles.org as well).