[ducttape45]

I’ve done that, it still updates without my consent......

[First_Salute]

Using the same route to the Update tab ...

Disable “Use a background service to install updates”

That is a feature of the Mozilla Maintenance Service:

https://wiki.mozilla.org/Windows_Service_Silent_Update

[BlueDragon]

try again going to "advanced". then select "check for updates, but let me choose whether to install them".

Then--make sure it's coming from Firefox?

I admit I haven't been diligent at that last portion, but I can stave off updating for months at a time, if so desired.

[Bloody Sam Roberts]

I’ve done that, it still updates without my consent..

That's odd. I have 25 and I am able to shut off updates. It never tries to update me. There may be something wrong with your install.

I would suggest getting MozBackup, backup your profile and your bookmarks then do a complete wipe of your Firefox...clean the registry too. There are easy tools for that. Ace Utilities for one.

Then get a fresh download of 25...or older if you like...and reinstall it. Import your profile and bookmarks then set it to not update ever. See what happens.