SideDock is a browser extension for tab-hoarders. Hover over (or hotkey) any post or video on X, YouTube, Bilibili, or Reddit and it opens in a slim sidebar — full description, hot comments, tweet like/bookmark — without leaving the page. I built it because I kept opening tabs just to check 'is this worth watching' and ended up with 40. Now I peek first, open later. Free on the Chrome Web Store. Safari build is ready but unlisted — sponsors welcome to help cover the Apple Developer fee.