We've got a major API upgrade this week which will greatly speed up the Masternode DAPP. We encourage you to use the browser extension for an optimum user experience.
who gives a guarantee, that this extension is safe for a ruser. There are many different extensions and applications now available, however, it's fairly reasonable to refer to downloading various sources.
The Halo team gives a guarantee that it's safe and they are usually vetted by Google before they are allowed as an extension, or so I thought. I mean it's just as safe as any other browser extension that a platform is using, if not safer. The great part about the platform is that you don't necessarily have to stick to the extension only, you can download the featherlite client which has the wallet, DEX, masternode DAPP, and block explorer built into it so far with more to come.
I run full mode of featherlite on my computer and it runs fast for me.