The last time I checked, multiple profiles support is somehow half-baked.
Add to Mozilla's perceived not-very-good management and you have a death spiral on your hands, and more power to Google and Apple to shape the Web towards their interests.
FWIW, first-class profiles support matters a lot: https://medium.com/sort-of-like-a-tech-diary/profiles-the-on...
Also check out firefox containers which is to profiles what docker is to virtual machines.
With profiles I can have different bookmarks, extensions, and even a different theme so I'm aware I'm on my personal profile, not on a work profile. Since switching profiles on Firefox + macOS is a pain in the butt, I use 2 different Firefox channels (stable + dev).
Anyway, containers are nice, but they're not a replacement for profiles.
Go to Settings, and search for Autoplay (or in the left navigation, select Privacy and Security and scroll to Permissions).
Click the Settings button next to Autoplay, and set the default to whatever you like (amongst them "Block Audio").
This itself is one issue; there are also all sorts of adventures they decide to go for little to not at all related to the browser development, and which are conducted to convince people all around the world that they're a good humane corporation that cares. Igh.
firefox --ProfileManager
And then to use them you have to start firefox e.g. : firefox -P <profile-name>
Very few casual users (nor even most technical users) start Firefox from a command line, and setting up shortcuts for these is also a step that most users won't do.The support for profiles is there, it's just hard to use in the context of a GUI desktop.
That's part of the "problem" with Firefox's support of profiles. It feels more like an afterthought and less like a primary use case the product wants to surface. To approximate the functionality Chrome has, I had to bookmark "about:profiles" and make it my home page.
Chrome also added this nifty feature that lets you open links as a Profile, making it easy to switch.
These may seem like small issues, but the end up mattering.
This, so much. Anytime I've brought up profiles on Firefox, I'm told about this alternative that isn't a replacement for the feature.
Safari is (finally) bringing this, so maybe the folks at FF will begin to see this as a feature worth investing in. First-class profiles support is one of the main reasons I stick to Chrome, despite trying to switch.