I just want to know why Firefox thinks it needs to be reinstalled every day, and what I can do to stop it.
Go to Solution.
You mean it keeps updating itself? You can disable the Mozilla Maintenance Service and see if that helps. This page explains how:
You could set Firefox so that it does not do automatic updates as well. The settiing is in Options > Advanced > Update.
This article also might be relevant: How to fix preferences that won't save.
Please update to firefox 19, then read How to fix preferences that won't save
Disabling the Mozilla Maintenance Service seems to have worked, at least so far. Thanks to every one for all the suggestions.