Thanks for the considerable effort you put into Session Alive. I know how challenging is coding. However, I've now read several responses from you stating that you don't recommend Session Alive use with banking sites. Ok, say so up front.
The problem I had - before I installed - is that at the top blurb level, it doesn't read '(Not for banking.)', nor does it state that anywhere in "About this extension". So I've wasted my time, but you don't want that, right?
BTW, I suspect this time-out duration issue is more about greed than security, more about the nationwide cost of cloud server seats. Years ago, my credit union default time-out was 10 minutes, but I could option for 40, which was enough for me. Then a national banking services company (was Digital Insight, now Candescent) took over with (originally) free web services forming a near monopoly at CUs. Now 10 has long been the firm limit. Yet my giant credit card bank gives me much longer, 20-30 minutes.
Also BTW, upper middle class users get around this corporate hassle (enforced on local CUs) by paying monthly for money management software that they need daily, which quickly logs in, uploads and downloads the state of multiple banking-financial websites, and quickly logs out.