Does anyone know if there's anyway I can put items (like links to my downloads and my add ons) on the right side of the tabbar?

Don't know exactly where you mean, but the chrome addresses for these items are

Addons chrome://mozapps/content/extensions/extensions.xul?type=extensions

Downloads chrome://mozapps/content/downloads/downloads.xul

You can create shortcuts for them just like bookmarks.

I'm talking about adding them like you would add a bookmark but placing them on the right side of the tab bar.

I think you would need an extension to add them.

I dont know any addon that add buttons for Addons or Downloads though.

If I understand correctly, basically you want the bookmark toolbar on the right side of the tab bar, right?

I don't think there's such an extension that does this yet.