I keep a lot of tabs opened - sometimes for months! - because I have articles that I want to read, but have not yet had the time to. I didn't want to leave them forgotten in a bookmark, nor did I want to Pocket/Evernote them because I don't know whether they're worth saving yet. OneTab is useful for this situtation. I can store my opened tab list all in one tab and open those articles later. Having 20 tabs condensed into one saves so much space. Don't have to scroll through the tabs nor open multiple windows anymore!

Simple to use. Simple and intuitive interface. Clear and concise how-to in Features/Help page. Indispensible!