Chrome only: Firefox users can already use the VidzBigger Greasemonkey script to tweak and customize popular video sharing sites like YouTube, and now the script has been ported as a full Google Chrome extension.

Google Chrome extension A Bit Better RTM is one of our favorite ways to tweak the popular Remember the Milk online to-do list web app, and now it's been ported as a native Google Chrome extension.

We've mentioned the A Bit Better RTM Greasemonkey script twice before as one of our favorite user scripts for Greasemonkey in Firefox, and the the native Chrome version works much the same way—the most noticeable feature moves the tabs over to the left, saving precious vertical space for widescreen laptop users, and making them more readable in general.

In addition, you can rearrange the lists, hide the lists you don't use, use keyboard shortcuts to switch between them, and even move an item to a folder from the keyboard. It's an extremely helpful extension, and this author, at least, is thrilled to finally have it on Chrome. A Bit Better RTM is a free download, works wherever Chrome does. Thanks, CookingCat!

Starting today, all builds in Google Chrome's dev channel will have extension support enabled by default—meaning Chrome is one step closer to the kind of extensibility that keeps Firefox die-hards from switching.

Not that extensions is the only thing that keeps users loyal to Firefox, but from what we've heard around the water cooler, that is the case for a lot of folks frustrated with Firefox memory bloat.

Google pushed out some sample extensions a while back (most notably the previously mentioned Gmail Checker), but now users no longer need to add that pesky --extensions-enabled switch to the end of their Chrome shortcut in order to get extensions working.