I cannot currently test the Mullvad browser, can you tell us whether it supports Ublock Origin or another competent ad-blocker (is there even another?). Because, frankly the ad-blocker is a make-or-break for me.
It does! So far I can see the following:
- uBlock Origin included
- mullvad extension to force DNS (disabled if you don't grant it permissions)
- button for "new identity" that clears all cookies and restarts
- NoScript included, but some JS permitted.
- Fewer customization options than firefox to resist fingerprinting
- Bucketed/discretized screen size to resist fingerprinting
EDIT: hard facts: https://mullvad.net/en/browser/hard-facts
Confirming what ekjhgkejhgk is saying.
It really just is Firefox with more privacy tuning. As far as I'm aware all the add-ons work as expected. I've used it as a trial and can confirm ublock works perfectly fine but that's the only add-on I tested.
Also, it is bundled with a mullvad add-on, but it is easy to remove.
You should also go to the Privacy and Security tab in the browser. By default it is set to Max Protection with Mullvad DNS by default. Even their lowest security is better than Firefox. But I would suggest editing this the "Mullvad (Ad-blocking)" option. I believe this is the same DNS as adblock.dns.mullvad.net (194.242.2.3)[0], which (base.dns.mullvad.net (194.242.2.4) is better) will be pretty similar to PiHole style ad-blocking.
I haven't tested in browser (I did test when setting up my PiHole) but Mullvad DNS can be a little slower compared to quad9 or cloudflare. But I don't think those two have ad blocking (and DNS ad blocking can be better in a lot of ways because it is not being blocked user side)
Btw, you can do this DNS stuff in vanilla Firefox too.
[0] https://mullvad.net/en/help/dns-over-https-and-dns-over-tls