Stylish is a free Mozilla extension that allows for the manipulation of web pages and XUL application user interfaces through the use of Cascading Style Sheets. These custom "user styles" are created by the user, or installed from an external archive like userstyles.org. It is available for Mozilla Firefox, Mozilla Thunderbird, Google Chrome, and Flock.

User styles are CSS style sheets designed to alter the appearance of one, some, or all sites, or of the browser itself, and are applied only to the targets specified. Individual user styles can be enabled or disabled in Firefox without having to restart the browser.

User styles are added to the CSS rules provided by the site, but can also override the site's styling (often requiring the !important keyword for each replacement rule). The most common uses are ad-blocking, applying a new color scheme, and eliminating unwanted page elements.

There are three classes of user styles:

Each site style changes the appearance of a particular Web site.

Global styles change the appearance of all sites.

Thomas Lee Bass (born October 3, 1962), best known as Tommy Lee, is an American musician and founding member of glam metal band Mötley Crüe. As well as being the band's long-term drummer, Lee founded rap-metal band Methods of Mayhem, and has pursued solo musical projects. He has been married to model Elaine Bergen and actresses Heather Locklear and Pamela Anderson.

Lee was born on October 3, in Athens, Greece, as Thomas Lee Bass, the son of David Oliver Bass, a US Army serviceman of Welsh descent, and Vassiliki Papadimitriou, a 1957 Miss Greece contestant. His family moved to West Covina, California one year after his birth. He received his first drum when he was four and his first drum kit when he was a teenager. Lee has one younger sister, Athena Lee (Athena Michelle Bass, b. 1964), who was married to James Kottak, the drummer for the band Scorpions and she was also the drummer of his solo band KrunK.

As a teen he listened to Queen, Kiss, Deep Purple, Led Zeppelin and Judas Priest. After listening to Kiss, his main drum influence became Peter Criss. After transferring from South Hills High School (West Covina, California); he joined the marching band at Royal Oak High School (now Royal Oak Middle School) in Covina, California.