Does your daily surfing routine involve visiting the same five sites every morning? If you have a regular set of favorite bookmarks, you can open them in a flash with Firefox add-on Speed Dial. According to the developer, this extension "loads in a tab, and will show thumbnail views of its assigned websites. Those thumbnails will be refreshed automatically in the background."
Note: This link takes you to the add-on's page at Mozilla.org, where you can automatically install the file into your Firefox browser. This program is donationware. It is free to use, but the author accepts and encourages donations towards further development.