Browser Development • Re: recover tabs after pm crash

What you want is setting the preference browser.sessionstore.max_resumed_crashes to 0 -- this prevents automatic session restoration after a crash or unexpected shutdown, and immediately shows the about:sessionrestore next startup. The default for this is 1, meaning it will try to automatically restore the session once before the sessionrestore page is shown, which is what you don't seem to want for your workflow.

No extension should be necessary for this behaviour.