Mozilla released Firefox 2.0 Beta 1 today. According to developer docs, all the new features for version 2.0 should be in this version. But it's by no means finished: Mozilla says you shouldn't expect your 1.x extensions and plugins to work properly, and there are certainly bugs. I had problems installing and running it on a computer with other beta software, for example.In a nutshell, if you've spent time customizing Firefox like I have, and you value a relatively bug-free browsing experience, you probably don't want to install this just yet. Like I mentioned, I installed it on a separate test computer so as to preserve my lovingly customized 1.5 installation.If you do decide to become a beta tester, this version will install separately from version 1.5. So you'll have both at once - but installing 2.0 will likely muck with extensions installed in previous versions. Here's Mozilla's download page.On to the new features! Right away, I noticed that there really wasn't much to notice. For the user interface, at least: This version looks very much like version 1.5. Changes are mostly under-the-hood.Those changes are welcome, though. One new thing is that tabs get their own close button on each tab. There's also a new option to re-open a closed tab. Both features are part of one of my favorite current extensions, Tab Mix Plus.newtab.jpgRSS feed support gets an upgrade, too. When you bring up a feed in the browser, there's now a "Choose a Feed Reader" button that lets you choose between adding the feed as a Live Bookmark; to the Bloglines, iGoogle, or My Yahoo Web readers; or to a standalone feed reader. Once you select a reader the button defaults to adding the feed to that reader. You can change your preference in the Options menu.feedreader.jpgAnd like the new IE 7, version 2.0 has anti-phishing. Amazingly enough, I don't have a phishing e-mail in my inbox right now to give me a link to test, so I can't tell you what the feature looks like. But it sounds like a basic blacklist feature, where you have the option of choosing to compare sites you visit against a locally stored list of known phishing sites or against one maintained by Google. You'll get a privacy notification pop-up if you choose Google that says the option will mean telling Google about all the sites you visit.anti-phishing.jpgBloggers should welcome a new spell-checker for text boxes. Incorrectly spelled words get a red underline; you can then right-click and choose from suggested spellings. Also, extension and theme management are now combined into one window, with a new option to disable extensions instead of just uninstalling them.add-ons.jpgHere's a full list of changes from Mozilla's site: * Built in Phishing Protection. * Search suggestions now appear with search history in the search box for Google, Yahoo! and Answers.com * Changes to tabbed browsing behavior * Ability to re-open accidentally closed tabs * Better support for previewing and subscribing to web feeds * Inline spell checking in text boxes * Search plugin manager for removing and re-ordering search engines * New microsummaries feature for bookmarks * Automatic restoration of your browsing session if there is a crash * New combined and improved Add-Ons manager for extensions and themes * New Windows installer based on NullSoft Scriptable Install System * Support for JavaScript 1.7 * Support for client-side session and persistent storage * Extended search plugin format * Updates to the extension system to provide enhanced security and to allow for easier localization of extensions * Support for SVG text using svg:textPath