Switch which side of the browser the sidebar is located.
Compatibility 
Works with: Firefox 3.6+
Background
By default the sidebar is located on the left side of the browser.
The Tweak
Using the ChromEdit Plus extension. Add these lines to your userChrome.css file located in your profile folder:
/* Display the sidebar in opposite side */
#browser {
-moz-box-direction: reverse;
}
Be sure to save and restart Firefox for the change to take effect.
Notes
Updated: November 15, 2025
