Have you looked at the add-on “temporary containers”. It can do automatic container creation based on domain and push new domains(or subdomains) to new containers.
I typed it in the search field, saw that it doesn’t have a “Recommended” tag and refused to click on it out of my overthinking about security 
Just came across this one from Mullvad VPN. Put it here as FYI.
It seems basically to be the TOR browser to be used with a reliable (their wording) VPN instead of the TOR network.
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Seems fishy. Fishing for customers who have no ideas how privacy works, imo. 
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TL;DR
Today we announced the launch of the Mullvad Browser, a browser built by the Tor Project team and distributed by Mullvad.
Our goal was to give users the privacy protections of Tor Browser without Tor. For instance, the Mullvad Browser applies a “hide-in-the-crowd” approach to online privacy by creating a similar fingerprint for all of its users. The browser’s ‘out-of-the-box’ configurations and settings will mask many parameters and features commonly used to extract information from a person’s device that can make them identifiable, including fonts, rendered content, and several hardware APIs.
Our mission at the Tor Project is to advance human rights by building technology that protects people’s privacy, provides anonymity and helps them bypass censorship. We want to give people options and demonstrate to the world that through partnerships like these, you can create technology with these values in mind.
That is why we jumped at the opportunity to help Mullvad with their browser. We agree with them that demand for a browser that is built to the same standards as Tor Browser exists.
click-bait
Thanks much for your clarification!
Still it seems a personal matter - whether to trust a VPN provider more than your web-provider - when it comes to privacy. - As for anonymity… that’s a different story (although Mullvad uses the word on their homepage, for advertising their service)…
After looking into it a bit, I’d venture to say that Mullvad-VPN looks quite good in that respect. Probably better than many of the popular VPN providers, afaict.
Apparently, Mullwad browser comes with the the VPN addon preinstalled.
However, there is no obligation to use it and one can remove it as well.
Speaking for myself, I would say I trust none of them 
I like the Mullvad VPN, but I can’t figure out why this browser is better than regular Firefox while using a VPN (such as Mullvad)?
From what I read in the Tor blog I linked to above, it comes pre-configured like a TOR browser:
the Mullvad Browser applies a “hide-in-the-crowd” approach to online privacy by creating a similar fingerprint for all of its users. The browser’s ‘out-of-the-box’ configurations and settings will mask many parameters and features commonly used to extract information from a person’s device that can make them identifiable, including fonts, rendered content, and several hardware APIs.
Apparently, it is made by TOR project team but distributed by Mullvad. However, the traffic to and from the browser doesn’t go through the TOR network.
It comes preinstalled with Mullvad’s VPN addon but that is optional to use. It can be /disabled/removed if one wishes so.
All that said, the regular Firefox can be hardened quite much for privacy as well but perhaps Mullvads does much of that out-of-the-box.
Have you given it a try? If so, any initial thoughts?
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I’ve started trying it out, actually, and so far like it!
There are some things to know about it:
Summary
To address the problems of “anonymous” surfing via VPNs, Mullvad offers the Mullvad Browser for download, which is based on the TorBrowserBundle.
As with the TorBrowser, all you have to do to install it is unpack the downloaded archive and then start the browser. Admin privileges are not required.
The Mullvad browser does not use VPN servers itself. You have to enable the VPN on the system level. The DNS servers of Mullvad are used via DNS-over-HTTPS. In contrast to the TorBrowser, the uBlock Origin add-on is installed by default and three different security levels can be activated, just like with the TorBrowser.
With the browser, Mullvad wants to define an anonymity group for the users of its VPN service, similar to the TorBrowserBundle. Therefore, you should not change the Mullvad browser configuration (not even the uBlock Origin filter lists).
By default, DuckDuckGo is used as a search engine. You can add other search plugins according to your preferences and configure them as default search.
Mullvad browser can be used for browsing without VPN server or with other VPN services - it could become a standard browser for VPNs.
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Sorry for the late reply! Just forgot that I had a reply pending until @anon11595408’s post popped up at the top of the latest post.
Right off the batch, I have to admit that I lack the technical know-how to audit the code myself.
Being developed by TOR project, I think we could rest assured that it comes from a reliable source.
I have had just a little time to test it out.
As mentioned by @anon11595408, you just need to extract the tar file and go inside the “mullvad browser” folder and double click on the launcher to start it up. That means it is run as a portable app and won’t need to be installed on the system. It’s configs and data etc are confined inside the “mullvad browser” folder. Once deleted it won’t leave any trace on the system.
With quite “sane” out-of-the-box" configuration The TOR Way, but without the TOR network, I think it might appeal to those users who want a private and secure browser without the “hassle” of turning and twisting Firefox to meet those requirements.
Combined with Mulvad VPN, if it lives up to its no-log policy plus its anonymous way of subscribing to the service, I think it would be a viable option for having some degree of privacy and anonymity without the sometimes rather unbearable slowness of TOR browser itself.
Speaking for myself, I would stick with Firefox for the time being. I have painstakingly configured different profiles for different use cases in order to compartmentalize my online life. I do also use Ungoogled Chromium with several profiles.
I think I would have Mulvad Browser for just casually browsing from time to time. Since it starts in incognito, I wouldn’t bother about cookies, browsing history etc. Once closed it is all gone and you can start it on a clean slate again.
All in all I think it’s a rather good browser and might find it’s niche in the Browser Jungle.
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Regarding anonymity on the net, TorBrowserBundle coupled with dnscrypt-proxy has been said to be a nightmare for those, wanting to peek in on your online traffic. - Of course, this is nothing for JohnQPublic since it requires expert-knowledge on how to stay hidden, beginning with one’s own online-behavior and way beyond that, into an expert system-configuration… 
Mullvad Browser (-bin) already in AUR: https://aur.archlinux.org/packages/mullvad-browser-bin
Here are a couple of YT reviews for the interested/curious ones:
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Does anyone here use MS Edge?
Completely surprisingly, oh what am I saying… completely shockingly, it turns out that Edge phones your browsing history home.
Of course, that was just an unfortunate misunderstanding, evidently.
“Microsoft Edge now has a creator follow feature that is enabled by default,” says Rivera in a conversation with The Verge. “It appears the intent was to notify Bing when you’re on certain pages, such as YouTube, The Verge, and Reddit. But it doesn’t appear to be working correctly, instead sending nearly every domain you visit to Bing.”
A stupid accident, of course! Can happen to anyone!!
(Invidious instance: https://vid.puffyan.us/feed/popular)
Do I understand this correctly, that Vivaldi is open source (in the sense that all the code is there for everyone to look at) but not free (in the sense that you are not free to use/modify/change the code)?
that is also what i understood. please correct me if i am wrong
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Thanks for the reply! I just wanted to verify if I am getting it right.
I just asked because there has been some discussion further up in this thread about Vivaldi being partially closed source and the closed part could potentially harbor all sort of “scum code”
So strip club rules (look but don’t touch)? 
Apparently you could touch it as well but not taking it home
Joking aside, he said that there are a number of modifications to the UI listed on their forum.
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