Just because you had an issue, that does not mean, that if affects "millions of users". And normally Firefox overwrites the old version, so please elaborate what do you exactly mean by not uninstalling the old one. Maybe you had the 32 bit version of Firefox until now?

Separate Security Issue: Update your Flash Player or remove it using these links; http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac

Note: Windows users should download the ActiveX for Internet Explorer. and the plugin for Plugin-based browsers (like Firefox).

Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the ActiveX.

Flash Player Version: Version 29.0.0.171

https://get.adobe.com/flashplayer/ Direct link scans current system and browser Note: Other software is offered in the download. <Windows Only>

https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, Win IE . . . .) Note: Other software is offered in the download. <Windows Only> +++++++++++++++++++ See if there are updates for your graphics drivers https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration

kgcrafts said

Just installed Firefox 60.0. Any reason why the installation process didn't uninstall my previous version during this process? I've found multiple occurrences of two versions on my computer. No big deal, I guess, because Revo Unistaller Pro was able to wipe out the previous version just fine. Just an inconvenience that could have been avoided had the Mozilla programming team set it up correctly. Now multiply that issue by the millions of users of this product! Nice!!

Some people may actually want to have multiple versions of Firefox with each using their own Profiles.

You useragent in More System Details right of you posts shows Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Firefox/60.0

You appear to be using the 32-bit Firefox 60.0 on 64-bit Windows as the WOW64 shows so perhaps one version of Firefox is 32-bit and the other is 64-bit (Win64) as they are installed in separate places.

on www.mozilla.org/firefox/all/ there is both 32-bit and 64-bit versions for Windows listed.