PermaTabs 1.4.0 - Create permanent tabs that don't close, and stick around between sessions
Popup ALT Attribute 1.3.2005092702 - Popups alternate texts of images or others like NetscapeCommunicator(Navigator) 4.x, and show long descriptions in the multi-row tooltip.
ReloadEvery 2.0 - Reloads webpages every so many seconds or minutes
SmartSearch 3.6 - Search for the selected text through your context menu, using any of your bookmark keywords.
Splash 1.2.2 - Adds a splash screen. Supported in Firefox, Flock, Thunderbird and Sunbird. (en-US)
StatusbarEx 0.2.9 - Display information on the statusbar, such as memory usage, network speed and so on. Please note that it need Microsoft VC++ 8.0 SP1 runtime library to work properly.