Firefox is really ok.<p>Vivaldi doesn't make a huge difference in term of resources (albeit it does snooze unused tabs so you can spare some ram) but it gives you much more functionality for what it costs you in terms off resource usage.<p>But even if the browsers can do something about it, the problem really resides in today's web apps / web sites conception : When you say "Chrome uses too much resource", even if I don't use Chrome, I'm pretty sure this is a false statement if you are browsing, e.g, HN. Even if you open dozens of tabs of it.<p>No browser can do anything to spare your RAM if you are forced to open tabs on Slack, Gmail, JIRA or the generally poorly developed business software.
If you can get beyond the political drama, Brave is fast, fairly efficient, privacy focused and runs on everything with bookmark sharing.<p>With HN loaded in 1 tab, Brave uses less than 250MB on my 64 bit Win10 system. With 2 different HN tabs, less than 300MB according to Task Manager stats. Not really "light" but not bad comparatively speaking.<p>I've read that Chrome has recently reduced it's memory requirements but I haven't tested it for privacy reasons.
Firefox... until it updated a few days ago and promptly stopped loading anything and couldn't even open preferences or respond to clicks. Restarted, etc, then tried uninstalling and reinstalling. Wouldn't let me reinstall. Now I'm on Safari.