How do I disable the forced and ABRUPT obligatory Firefox updates?

I don't know who was the absolute '''LOSER '''to have the idea of forcing updates while the user is still working on the browser by shutting the browser down. Can someone else help me understand how to stop this nonsense?? '''And yes, I had the option ''"Check for updates but let you choose to install them"'' selected, and I'm still being molested by this forced restart """feature"""!''' Every time I'm in the middle of an important work session, Firefox will suddenly refuse to open new tabs and prevent the ones that are already open from connecting and receiving updates. It erase private tabs and messes up everything! I was in a call with my boss, and it got dropped because Firefox decided to update?? And DEMANDED that I close the browser IMMEDIATELY to continue using it????? What the hell??????????? I've only been running into this problem in the past few months, and I'm honestly shocked by how little uproar I'm seeing online about this bug. This is by far the worst think I've ever seen in a browser. Anyway, I appreciate any help. I saw a trick to permanently disable updates, but I don't want to disable them. I just want them to be installed either when I CHOOSE or when the bloody browser is NOT in use!