Firefox Configuration Tweaks
Categories:

Update these in about:config

// Disable GIF Animations:
image.animation_mode = none ("once" to play them only once)

// Load diverted tabs in the background.  Also prevents Firefox from jumping to foreground when clicking on a link in another application
browser.tabs.loadDivertedInBackground = true

// Stop NoScript from opening a web page on every update
noscript.firstRunRedirection = false

// Enable "bartab" like function in Firefox 4
browser.sessionstore.max_concurrent_tabs = 0

// Show titlebar when maximized if Firefox 4
browser.tabs.drawInTitlebar = false

// Prevent app tabs from autoloading when starting the browser
browser.sessionstore.restore_pinned_tabs_on_demand = true

This no longer works for Firefox 4. Use "Custom Tab Width" extension instead.

// Allow tabs to get smaller when many are open - http://kb.mozillazine.org/Browser.tabs.tabMinWidth
browser.tabs.tabMinWidth = 38