Where can I go to update Firefox? I was notified to update the browser. There was a screen telling me to download Firefox but then it disappeared.
U can Update Firefox in very easy steps
Can I install the update over the existing version, or do I need to uninstall and then install the new version?
You can install a newer version over an older one with no issues.
In order to update the browser, navigate to the official web page, click the green Free Download button, save the file to your computer and install it following the on-screen instructions. If you have issues, use Mozilla Support page to get in touch with the support team.
it should automatically download and then restart when finished
go into help, click check for updates, then it will tell you whether or not you have updates. If its an update to an addon, it will display in the taskbar
Its easy check for updates on site
it should tell you when you need updating, at least my did so :D :)