Update 1/24/2018: I just submitted v1.17 and you can now turn off auto-minimizing.

Thanks for your review. I agree with pretty much everything you said there. Unfortunately the API does not allow creating tabs with privileged URLs, that includes file:/// URLs (local files). Those tabs could be set aside but not restored. Therefore I decided not set them aside at all. (https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/tabs/create)

The next version (v1.17) will include an option to not auto-minimize sessions.

Any specific ideas for keyboard shortcuts? Please let me know: https://github.com/tim-we/tabs-aside/issues/7

I do not see a good way to implement thumbnails. If anyone has good idea of how to implement this please let me know: https://github.com/tim-we/tabs-aside/issues/4
Suggestions and contributions (this is an open source project after all) would be greatly appreciated.

Anyway, thanks for the feedback & suggestions.