We want the Firefox Options selections we make to be preserved. It seems like some of these Options get re-set to something different, from time to time. For example, Options - General - Files and Applications - Applications - Choose how Firefox handles the files you download from the web or the applications you use while browsing. Content Type: PDF, Action: [we change it to what we want, such as "use Bluebeam" or "use Adobe" or "preview in Firefox", and then it will re-set to something else, such as "Save File" (which saves the file to Downloads and does not open the file in a program)] And also Options - General - Firefox Updates - Keep Firefox up to date for the best performance, stability, and security. Allow Firefox to... Automatically install updates (recommended) OR Check for updates but let you choose to install them [in older versions of the browser, there was also a third option for NOT automatically checking for updates at all. But newer versions of Firefox do not seem to offer this.] Whichever of the first two options we choose, we have had cases where Firefox does not preserve the selection and switches the user to the other selection. When the selections get re-set to something other than what the user chose, it likely happens due to a Firefox software update. I have been told by an IT consultant that the way to preserve the selections is to use Firefox Sync and under "choose what to sync," make sure the "Options" box is ticked. But we have done that, and users with Sync turned on still find that not all of their Options selections are preserved.