Originally Posted By: tanstaafl.
But then Firefox did an update (without my asking it to

If you don't want a feature set in the browser that may change every 4-6 weeks with new versions, switch over to their "Extended Support Releases". These only get upgraded once a year as far as features go, but still close security holes when found.

https://www.mozilla.org/en-US/firefox/organizations/all.html