If it doesn't load in Firefox, it isn't worth loading. That's my stance i won't budge, i need no website enough to use chrome ever again.

Vivaldi is pretty good, just ignored because it's not opensource. It does not come across as Chrome/Brave evil.

I use Vivaldi alongside Firefox. And yes, Vivaldi is great. It has a really really nice tab management system which I really wish was on Firefox. Otherwise it's very fast and very customisable. I recommend to at least give it a solid try.

Although not OpenSource it is Source Available: https://vivaldi.com/source/

I like the way Vivaldi works and the tabs. I switched to Firefox purely to support having chrome alternatives.

I have no real answer to your question though

What sites do you have issues with if I may ask?

No. Vivaldi is proprietary.

Their CEO is not an asshole (at least not publicly) but they are still not committed to privacy. Vivaldi is a commodity browser, they include UI features and other usability features which are nice. But it isn't private, at all.

They have their own telemetry which includes an unique ID per installation and they basically have no protection against fingerprinting, a feature that Firefox (and Librewolf and Mullvad Browser) and Brave (do not use Brave) have and I consider essential.

Honestly, I use FF as my primary on Linux, and Waterfox as my primary on Windows (just because it runs better than FF on Windows fir some reason). Vivaldi I use as a secibdary browser when:

1. I need to visist a website that for some stupid reason doesn't open on FF
2. When I'm studying or need to have several tabs open at the same time (by several I mean 100+, Vivaldi has really good tab management)

EDIT: I sent the reply without answering the question, I'm dumb. Anyways, some people like Vivaldi, some don't. If you ask in a Privacy forum (and especially Lemmy) you will find less favorable opinions of Vivaldi.

My suggestion at the end of the day is just try it out and try to make your own research on how it was created and who is in charge. As I've undestood until now (don't know if it has changed) is that the only thing proprietary about Vivaldi is the design(? Idk, someone correct me if I'm wrong) and that the CEO is not an.asshole (yet)

I really like it and think that it has cool features that really help with productivity

I wish that it was actually open source (they don't include the full code, most of the source is just chromium stuff and it's published in tar archives and not git repos)

On my PC, I use Vivaldi most of the time, Firefox when I want extra privacy, and ungoogled-chromium almost never

Absolutely not. Its proprietary

I would be much more happy to give Vivaldi a go if we lived in a world where much more browser diversity existed.

You’d need a very good reason to not use Firefox given that it’s all that stands against a Google monopoly on web standards. I was using a Chromium-based browser myself until Opera and Microsoft both abandoned their own browser engines - after that I couldn’t possibly justify not supporting Firefox.

Vivaldi does look very good, and takes me back to the old Opera days when Opera was good. But from a privacy point of view it's just short-sighted to use a chromium-based browser, even if that browser promises and provides privacy.

Haven't used it myself yet, but I've seen it recommended: the User Agent Switcher extension. It might fix some websites you have issues with?

Just use firefox

I use Vivaldi for all my chromium required browsing activity.

Works pretty well !

Customisation also great!

What about Cromite? I use it as my backup https://github.com/uazo/cromite/

Vivaldi is decent IMO but there are some telemetry some might find distracting. BTW, are you using Windows? What do you mean there's no easy way to update Ungoogled Chromium?

I use vivaldi as my secondary browser and its honestly really nice, and has an absolute ton of extra features to play around with, the settings menu is impressive.

Vivaldi is great. I have trouble committing to Firefox because I'm far too dependent on Vivaldi's tab management.

Librewolf?

I've been using that for a while since I ditched Chrome, and anecdotally it seems like it hits a pretty good sweet spot of "privacy-protecting to such an extent that I notice little annoyances as I browse the web, but they're all trivial and easily bearable, which probably means it's doing quite a lot to try to protect me."