A browser extension is a computer program that extends the functionality of a web browser in some way. Depending on the browser and the version, the term may be distinct from similar terms such as plug-in or add-on. Mozilla Firefox was designed with the idea of being a small and simple web browser, delegating more advanced functions to Mozilla extensions.^{[citation needed]}Microsoft Internet Explorer started supporting extensions from version 5.. Google Chrome started supporting extensions from version 4. The Opera desktop web browser supported extensions from version 10. The Apple Safari web browser started supporting native extensions from version 5. The syntax for extensions may be quite different from browser to browser, or at least enough different that an extension working on a browser does not work on another one. As for search engine tools, an attempt to bypass this problem is the multitag strategy proposed by the project Mycroft, a database of search engine addons working on different browsers.

Ryan Thomas Gosling (born November 12, 1980) is a Canadian actor and musician. He began his career as a child star on the Disney Channel's Mickey Mouse Club (1993–95) and went on to appear in other family entertainment programs including Are You Afraid of the Dark? (1995), Goosebumps (1996), Breaker High (1997–98) and Young Hercules (1998–99). His first serious role was as a Jewish neo-Nazi in The Believer (2001), and he then built a reputation for playing misfits in independent films such as Murder by Numbers (2002), The Slaughter Rule (2002), The United States of Leland (2003) and Stay (2005).

Gosling came to the attention of a wider audience in 2004 with a leading role in the romantic drama The Notebook, for which he won four Teen Choice Awards and an MTV Movie Award. His performance as a drug-addicted teacher in Half Nelson (2006) was nominated for an Academy Award and his performance as a socially inept loner in Lars and the Real Girl (2007) was nominated for a Golden Globe Award. In 2007, he starred in the courtroom thriller Fracture.