Open tabs gradually rather than all at once

[davidelang]

on chrome/brave if you open too many tabs/windows at a time, it gets stuck on some lock and performance slows to a crawl, for me this seems somewhere around 100 or so tabl (sometimes more, sometimes less)

please add an option to throttle how fast tabs get opened, possibly trying to detect that a tab has finished loading, possibly just time based

[cxw42]

A very reasonable request! PRs welcome :) . This will also be less problematic once #35 is finally rolled out, and that's the next thing on my list.

Thanks for using TF and for the feedback!

[cxw42]

Related to #51