Startup Pack-It Button
I just started and in your quick and nice intro steps there is the one for setting up the pack-it button.
I needed a bit to understand as I expected to install an extension.
Unfortunately the dragging worked not right away (in Opera) as I happened to select the text on the button instead of dragging the button. Maybe integrate the text into the image to evade that problem.
also: you could think of adding a sentence: "or install the extension" with a link to a description. Some people might not have a bookmark line per default or it is hidden or they just want the button to be outside of their bookmarks.
But anyway the implementation like this is very cool and easy!