FF 57 will break legacy extensions. I have several of these which I want to keep working. For this, I want to prevent FF from auto-updating. However, although previously you had the option of doing that in the "Advanced" tab of the settings panel (as can be seen below)...
...now in FF 56, that option has been silently removed. The advanced tab doesn't even exist any longer:
This is very annoying and has put us users in collision course towards the day FF 57 is imposed on us, and we suddenly find ourselves with missing functionality on which we have come to rely.
But there may be some other way I'm not aware of to prevent auto-updating. I know that updating brings security fixes, new features, etc. I'm not interested in any of those. I just want my normal work not to be disrupted by missing extensions.
Can forced auto-updating be prevented in any other way?