Maybe the 52.9.0 version is a 32-bit version because you have 64-bit Firefox 61.0.1.

The Mozilla Maintenance Service is used to download and install updates in the background without having permission issues (UAC pop-up) You once allow this service then you install MMS and then it can do its job in the background.

• Options/Preferences -> General -> Firefox Updates: "Use a background service to install updates"
• https://support.mozilla.org/en-US/kb/what-mozilla-maintenance-service

Actually the version isn't 61.0.1, its 63.0a1. Any idea what I'm to make of that if anything?

Hi and ya why are you running a Alpha version ? It may have installed it's own Maintenance Service I tend to leave those builds alone as they Crash and Burn. Suppose to report those to bugzilla when do flame out.

Your 2 versions may have become intertwined now unless installed on separate partions using custom install.

You may want to do this with your ver 52.9.0 which is a update behind :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Full Version Installer

• https://www.mozilla.org/firefox/all/

Developer Edition is another matter as it is always in Beta. It also has a Compatibility Mode that comes up after installing it so can run 2 versions.

Yes my understanding is that Thunderbird can make a Maintenance Service.

To be sure maybe someone else knows.

Can always check with them : https://support.mozilla.org/en-US/products/thunderbird Then decide what your going to do.

Do do the backups though asap.