Earlier today, November 23rd, Canonical uploaded the final bits of the Mozilla Firefox 8.0 web browser on the official software repositories for the Ubuntu 11.10 (Oneiric Ocelot) operating system.
All Ubuntu 11.10 users can now upgrade (by running the Software Update app from the Settings icon) their default web browser to Firefox 8.0, which was officially released by Mozilla two weeks ago, on November 8th, 2011.
Mozilla Firefox 8.0 brings features such as integrated Twitter search, tabs can now be loaded on demand (greatly improving start-up time), an one-time add-on selection dialog to easily manage your installed extensions, HTML5 context menus support, better memory performance, insertAdjacentHTML support, better CSS hyphen support, better WebSocket support and CORS support.
Keep in mind that after the upgrade, you have to restart any running instances of Firefox. After it restarts, Firefox will pop-up an one-time add-on selection dialog with third party add-ons disabled by default. Therefore, you'll have to manually enable all the add-ons you want to use.
Firefox 8 can also be installed on older distributions, such as Ubuntu 10.04 LTS and Ubuntu 10.10 by following our genuine tutorial
. Also, if you want to install Firefox 9.0 on Ubuntu 11.10, follow this tutorial