One of my favorite addons using Firefox is Easy App Tabs, which allows you to pin a tab by double-clicking it. Alas, Chrome does not currently allow addon makers the possibility of doing this as of this posting, but we do have two alternative options.
The first is DoubleClick Pin Tab, which allows you to double-click anywhere on the page to pin that tab. It's not as intuitive as double-clicking the tab itself, but one can make the argument that this makes it easier to pin a tab now that you do not have to move your mouse to it!
The second is URL Pinner, which allows you to pin a tab via a keyboard shortcut(like CTRL-Q, for example) and it also offers the functionality of setting certain URLs to autopin themselves upon loading that page, which is particularly useful for the webapps that you always need open or always use while pinned.
