... since Firefox 0.9 is due to be released tomorrow, at least according to the Firefox team.
I would recommend you first remove all traces of Firebird from your computer before installing Firefox, especially what Firebird had used to store user profiles.
As for extensions, I would suggest, at the minimum, Tabbrowser Preferences which gives you slightly more control over tab behaviour without the bloat and instability of Tabbrowser Extension. Copy Image is another small yet useful extension to have: it allows copying of images to the clipboard. However, since I've not followed the release candidates, I'm not certain which extensions will still be useful after 0.9, and which ones will have their features built into Firefox.
As unrealshadow13 said, no, you can't get rid of Internet Explorer as long as you are running a relatively modern version of Windows. The IE rendering engine is shared by several key components of Windows, including Windows Explorer, the Windows filemanager, as well as the Help application. Also, Windowsupdate can only be done through IE.
I would recommend you first remove all traces of Firebird from your computer before installing Firefox, especially what Firebird had used to store user profiles.
As for extensions, I would suggest, at the minimum, Tabbrowser Preferences which gives you slightly more control over tab behaviour without the bloat and instability of Tabbrowser Extension. Copy Image is another small yet useful extension to have: it allows copying of images to the clipboard. However, since I've not followed the release candidates, I'm not certain which extensions will still be useful after 0.9, and which ones will have their features built into Firefox.
As unrealshadow13 said, no, you can't get rid of Internet Explorer as long as you are running a relatively modern version of Windows. The IE rendering engine is shared by several key components of Windows, including Windows Explorer, the Windows filemanager, as well as the Help application. Also, Windowsupdate can only be done through IE.