great ideas but poor implementation.
when I enable this addon, and then do any bookmark operation my memory usage goes as high as my max RAM.
and bookmark operation becomes very slow. so for example if I copy 400 bookmark from one folder to another folder, the memory usage goes very high and bokkmarks get copied almost one by one and very slowly.
I think this is because I use the feature that uses search engines from bookmarks and the addon searches bookmarks every time a bookmark changes, which is a very bad and time consuming implementation.
the addon should have an option (or a button) to load from bookmark only once, and not monitor bookmarks.

UPDATE:
fixed in new version.
thanks for fast reply.
I already went with another addon though.
because every time I open the menu with right click the icons of my search engines are loaded through internet one by one as if there is no such thing as caching. either have an option to disable icons or cache them or give custom icon support that are not internet dependent.

2nd UPDATE:
thanks for the reply.
I changed my rating of your addon just because you give fast replies :).
if I remember correctly in earlier version of firefox I had addons that you could give '.ico' files as icons.
I think firefox new system has limitation for file storage on profile so you cant easily save icon files and use them but maybe that 'unlimited storage' can be used somehow as a workaround to store icons.
If it is not obvious I am not a developer so I take your work for it.
and thanks again.