I never thought that I, considering the number of Firefox extensions sometimes do not think that's right.
Just planned my Firefox was a little "clean up" and to call on an important bookmarks on the left sidebar by icon. Ready-plugin fail indicator!
After some research I did then but finally found a way to realize my plans.
This is how Evan Rowals in his blog how to use the " All-In-One Sidebar "extension and" Custom Buttons ² "extension can be built on such a Lesezeichenbar.
As his example code for the button but can call AddingAPTInternetsources nicthmehr, I've tinkered with the help of the Custom Buttons Forum, a custom solution.
