awesome Rated 5 out of 5 stars
10/10, awesome. Been wanting exactly this for ages.
Most websites in Left To Right reading languages (e.g. English) are either left or center justified and I found it incredibly annoying that the webpage i was looking at jumps to the right each time i open the sidebar.
The original sidebar (on the left) must work great for people that use Right To Left languages (like Hebrew, etc).
FIREFOX TEAM - Include this in FF3!