Close the current tab/browser when there is no page history.

Works with mouse gestures and will work with the back button on mice by configuring as follows: configure the back button on your mouse to send Alt-Left Arrow.

Mozilla Corp. will try to squeeze more into Firefox 3.1, in part as a reaction to rival browsers from Microsoft and Google, the company's chief engineer said today.

"Looking at where we are and the competitive browser landscape, we felt we would be doing a better job if we had another four to five weeks," said Mike Shaver, Mozilla's interim vice president of engineering.

IdentFavIcon is based on the idea of Don Park called identicon to generate visually pleasing and easily recognizable icons from identifiers, such as IP addresses. This extension replaces the default favicon for web pages without one with a visually pleasing identicon, which is unique for each domain. The extension uses the CRC-32 code of the web page's domain name to seed the identicon renderer.

FirePHP enables you to print to your Firebug Console using a simple PHP function call.

FirePHP is ideally suited for AJAX development where clean JSON or XML responses are required. All data is sent via a set of X-FirePHP-Data response headers. This means that the debugging data will not interfere with the content on your page.
You must have Firebug installed and the "Net" panel enabled to use this extension.
You must also download a PHP library from http://www.firephp.org/

In a post to the Firefox planning newsgroup, Mozilla Corp’s Mike Shaver, announced that there will be at least two betas for Shiretoko, Firefox 3.1 code name.

The main reason is to allow enough time to bake a high quality private mode as announced earlier this week but some other minor but sensible changes will take place as well.