Rereading your two posts, here's what I pick up:
1. He is the sole breadwinner.
2. You have an emergency fund, but of indeterminate amount.
3. You think his job is secure, and he effectively has PTSD from previous job losses.
I'm pretty sure I get where his stress is coming from, especially if you have fewer than a year's worth of an emergency fund. If I were the sole breadwinner, I'd have a hard time taking it easy at work unless I knew we were really set, financially, especially given the current economy. And when you throw in his history of job losses and scares, it's not surprising to me that he thinks he needs to do everything he's doing in order to hold on to this job. Regardless of how much of this might be in his head, if you really want him to feel secure, you need to show him with cold, hard numbers that his entire family won't be out on the streets in a year if it took him that long to find a job if he lost his tomorrow.