Here are five quick tips to enhance your Firefox 3.6 experience.
1. Open links in the tab bar far right
In Firefox 3.6, links opened from a web page (middle-clicking on them or from the context menu) open to the right of the current page to keep related content closer by default. To restore the previous behavior, access the advanced preferences by visiting about:config, then look for preference browser.tabs.insertRelatedAfterCurrent and set it to false.
2. Enable tab previews
If you prefer to see tabs thumbnails when switching tabs with Ctrl + Tab, set browser.ctrlTab.previews to true via about:config.
3. Enable tab previews menu button
Convert the list all tabs button (far right in the tab bar), set browser.allTabs.previews to true via about:config.
4. Tab previews hotkey
To quickly access the all tabs preview panel (once enabled) and search press Shift + Ctrl + Tab.
5. Hide the menu bar
On Windows, you can now hide the menu bar to gain a few thousand pixels for the actual content. Right-click on the menu bar and uncheck Menu Bar. To show it temporarily, press the Alt key.