Firebug is one of the most popular add-ons for Firefox: it's a web development tool that highlights elements in a page's HTML source, allows for live editing of CSS, and more.

Now Chrome users can get on the Firebug bandwagon, too, with the new Firebug Lite extension. It's not a full Firebug, and it's not meant to replace Chrome Developer Tools, but it does replace the Firebug bookmarklet for Chrome.

This release -- Firebug Lite 1.3 -- doesn't have everything the Firefox version of Firebug has, but it's getting there. 1.4 is slated to include important stuff like live editing for all panels and a search feature. For right now, though, Firebug Lite is an essential download if you want to see what's going wrong with your stylesheet or get a detailed look at how someone else's page layout was built.

Plus, it lets you turn on Firebug for any domain, right from a toolbar icon - no more messing around with bookmarklets!

One video depicts how Firefox might look when you're rearranging browser tabs in the future. The other shows what it will look like when you create a new tab. In a nutshell, it looks like Firefox 4.0's tabs might behave exactly like those in Google Chrome.

In Firefox 3.6, when you click a tab and drag it you see sort of a shadow of the web page you're currently viewing. You can drag it to the position on the tab bar where you want to drop it, and the tab bar will snap into place. Chrome and Firefox 4 feature smoother transitions.

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Google is working on something mysterious that has to do with Gmail and social networking, but the details are still under wraps. The new product will be unveiled tomorrow, and it could be anything from integrating Gmail status updates with Twitter and Facebook to launching a full-scale Twitter-like service of its own.

Here's what we're hearing so far:

TechCrunch says the new product will "intregrate with at least two existing Google products. The general consensus in the tech blogosphere is that one of the two is Gmail. The Wall Street Journal says the new product will make it "easier and faster for user of Gmail to view media and status updates." (Media, eh? Is the other Google product YouTube?)

Meanwhile, over at Mashable, they're calling the pending announcement "HUGE" and saying Gmail will offer a Twitter-like timeline of your friends status updates, as well as integration (Twitpic and Yfrog-style, maybe?) of Picasa photos and YouTube videos. We won't find out until 10 AM Tuesday what this new Google hotness is called, but we can start speculating! What do you think, DLS readers?

p.s.: I haven't actually heard anyone call this thing "Google Stream," but don't you think it would make a catchy name?

Liquid Scale is an iPhone / iPod Touch app that allows you to resize images by removing unimportant elements in the photo, leaving the important ones untouched. It's a technique called seam carving that we've previously mentioned, but what's interesting here is that it's now available to be used on the iPhone.

For those that are unfamiliar with it, the seam carving technique analyzes images to determine the most and least important elements, and when you use it to decrease the size of an image it removes the least important parts first, in tiny 1 pixel wide slices. It can be a slow process, particularly on larger images, but the result is often much more compelling than what can be done with a simple crop. Of course, if you're not careful to use the effect sparingly, the results can go from impressive to flat-out weird pretty quickly.

Liquid Scale is available for $2US in the App Store.

[via Daring Fireball]