For lightweight yet full-featured browsers, I rely on Pale Moon and SRWare Iron. They both have a basic philosophy that the parent browsers are to resource hungry, and that they spy to much. Their approaches to the problem are different.
Iron simply recompiles the latest and greatest Chromium/Chrome release, with all the spy features disabled. It's good, and I recommend it.https://www.srware.net/en/software_srware_iron.php
Pale Moon forked Firefox several versions back. And, it's a work in progress. It is diverging from Firefox, and eventually, it won't really resemble Firefox a whole lot. But, it's goal is to remain lighweight, AND to preserve privacy. It is also good, and I recommend it over Iron.http://www.palemoon.org/
"Former CEO starts new Opera browser
Jon von Tetzchner, co-founder of Opera and until 2010 CEO of the company, begins a new browser that is mainly aimed at power users. Von Tetzchner and his colleagues believe that Opera has gone on the wrong direction."
The new Vivaldi browser can be found here, although I can't recommend it yet. https://vivaldi.com/
My observation is, ALL of the older, more established browsers are abandoning the users. It's time for some upstarts to bring something new to the table.
I can remember when Firefox was the "new kid on the block".