1. Opera
In the past, this browser was abandoned because it was too outdated and the features provided were not as many as other browsers. However, unlike now, Opera has become the browser which until now is known as the lightest browser among other browser lines.
In addition, Opera has a unique feature, VPN Unlimited, which allows you to open locked websites without having to download a VPN via an extension. Apart from that, Opera also has a built-in ad-blocker so you can avoid annoying advertisements while you are surfing the Internet.
The Opera browser supports many OS, such as Windows, macOS, Linux, Android and iOS
2. Mozilla Firefox Quantum
When Google Chrome was first released, it had an advantage in terms of speed and usable features when compared to other browsers. Now, that is not Mozilla's weakness now. In 2017, Mozilla released their latest browser which is claimed to be the fastest and lightest browser that can beat Google Chrome.
The browser has a faster page download speed of a fraction of a second when we compare it to Chrome. Just like Mozilla Firefox in general, this browser minimizes the use of a very large RAM.
3. Tor Browser
The browser, which is often known as the "deep web browser", turns out to be the lightest browser like the other candidates. Tor Browser doesn't really eat up your RAM performance, especially if you have a potato PC. The author also uses this browser occasionally and it turns out that this browser consumes less RAM, when compared to the two candidates above.
What is quite special here is the security features provided by Tor. We don't need to worry and be afraid if our data is leaked or taken by ignorant people on the Internet. Even when using Tor we cannot be tracked at all by someone, so we can surf the Internet completely anonymously.
4. Vivaldi
Some of us are unfamiliar with this one browser. Vivaldi is the latest browser released in 2016, by Opera and also as CEO of Vivaldi Technologies, namely Stephenson von Tetzchner and Tatsuki Tomita.
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The development of this browser is quite fast and until now it has 1.9 million active users on the Internet. The thing that makes this browser grow rapidly is that Vivaldi is a browser that has a lot of customization features when compared to Chrome, Opera or Mozilla.
Users can change themes as they wish. Not only that, Vivaldi is also equipped with a sidebar that can suit the user's wishes, be it news sites, social media, games etc.
Unfortunately, Vivaldi only supports certain OS, such as Windows, macOS and Linux. However, they have also tried to get into Android, even though the browser itself is still entering beta mode.