Add-ons Functionality !
Some of Firefox add-ons does not appear in Toolbar. They are only visible in Options-Add-ons page, which means that they are with bad functionality ! Why is that ?
Some addons simply don't need any visual button on a toolbar. It doesn't mean that they are with bad functionality.
What Add-ons is this about ?
Did you check the screenshot images and read the description on their Add-ons page ?
由 cor-el 於 修改