Show Debug menu:
When enabled the Debug menu is shown in Safari's menu. The debug menu provides advanced settings and features for Safari.
Disable support for page icons:
Page icons are also called favicons or favorite icons. These icons are set byt the designer of the website and is shown in front of the bookmarks and in the address field.
Disable form modification warning on close:
By default Safari will display a warning if you close a page with a modified form.
Disable webpage previews:
Safari 4 & 5 will not store preview images.
History settings:
History is a tool for finding your way back to a page which you have visited. History limitations can be set by number of pages, number of days and number of menu items.