Not exactly what you asked for, but for what it's worth Firefox will happily accept and open a list of URLs that you drag and drop from your text file into the browser. I just tried it.
Would be neat if you could just select a standard tuning and then have a spinbox to say how many steps up or down to modify it. Makes lots of combinations available.
This plugin has "Copy all to clipboard" button which does that https://github.com/antonycourtney/tabli