Hi,

Would you please take a look at this article  ?

How to fix preferences that won't save

Any good  ?

Separate issue :

Your system details show that you need to update your Adobe Flash Player - you are running a very old version, which can cause probems.
Would you please uninstall your current version and install the latest version, which is 28.0.0.137

https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html

https://get.adobe.com/flashplayer/otherversions/

Note : some 'extras' may be offered in the download.

The solution to my problem is not on the "how to fix preferences that won't save" page.

I checked the page thoroughly. This isn't just me blowing off your advice.

My problem isn't that a firefox preference won't save. I'm asking -

1) Is there a preference somewhere that dictates whether firefox will make itself the default for images

2) if this does exist, where is it and how can I change it. If it does not exist is there a work around or should I just never use firefox for downloading anything.

I don't think that Firefox would make itself the default application for image files.

Is this with image files that you are downloading in Firefox or are send with a content type that forces an open with download dialog?

For download actions in Firefox see:

• https://support.mozilla.org/en-US/kb/change-firefox-behavior-when-open-file

See also: How to change the default application for a file type | Macworld:

• http://www.macworld.com/article/1154861/changedefaultapp.html

this is definitely happening...

and I know how to change the default file type. I change it back to preview any time I accidentally download an image through firefox.

The change happens any time I download an image through firefox. That includes both clicking "download" and dragging and image from firefox to my desktop.

Maybe this will be more helpful  :

https://www.macworld.com/article/1154861/os-x/changedefaultapp.html

Edit :

Already posted by cor-el .....