Your bonus is my primary reason for using the service. Invidious, old.reddit.com, Gmail HTML Mode, are perfect examples of the great user experiences we've lost in the pursuit for New Shiny. Directly comparable with their "modern" counterparts. It would be nice if websites started to offer a cut-down version as an option, especially for users in 3rd world countries.

Is there a browser extension to switch to lightweight versions of web apps like these?