The purpose of construction is a logical and useful tool. But the menu is messy, I never liked the font type. In the options section, it would be better to write a few sentences instead of a lot of explanations.

Edited since I found the email contact. I've gone back to using an old load tabs progressively extension which seems to partially work but ideally I'd like to use something more up-to-date. I primarily just want to be able to load background tabs one at a time and have it work for all sites, including the new Twitter web experience (based on mobile.twitter.com). Thanks!

The idea is great but from the description it seems that it has a lot of issues that wouldn't make it useful at least to me how it's now. but I'll be looking forward for the fixes.
BTW when you say it's not supposed to work with session restoration or something like that; does that mean that when you restore a session with non loaded tabs from your addon they wont be able to be recovered?