I finally turned off "Show my windows and tabs from last time" and instead used "Restore Previous Session" to bring back the previous session.
I quit and restarted TenFourFox to recover memory (dontcha love that!). And I noticed something that I haven't seen spelt out anywhere when TenFourFox restarted: the previous Web App tabs all reappeared (as app tabs) even though you're not asking it to remember any session. Interesting. Though what seems even more odd, on TenFourFox at least, is the web apps restored to a "not current" version of the web page. The page that came up was from some time yesterday (not even the one I had at quit time for the app). Weird. That was true for all 5 web app tabs: they must be caching and reshowing old data rather than going to the web (supporting for locally cached HTML5 style web apps that you can use off line?) I guess Firefox 4 is a bit like Perl: there's more than one way to do it. And some of them are wrong or at least unexpected.↧