Save space. Be more efficient. Rated 5 out of 5 stars
I like a minimalist browser UI, so along with "Tiny Menu" and selected "Custom Toolbar Buttons", the "All-in-One Sidebar" (AIOS) becomes my main focal point for tools and info within FireFox. Vertical space is a premium. I need the status bar at the bottom (FireFox version 4+ requires "Status-r-Evar"), tabs and a toolbar at the top, and everything else in "AOIS".
There are multiple ways that AIOS can help. First, there is the toolbar. It contains buttons to functions and other add-ons that I use often and I want to access quickly. Second, there is the sidebar switch, which with one click "AIOS" sidebar expands and collapses. And last, within the expanded sidebar, I can view info about FireFox, the current web page, or the output from various other add-on's. I would be remiss if I left this comment without saying, "AIOS" puts the user in control of their environment, it works flawlessly, and the author is very responsive.