Oct 14, 2026, 5:25 PM@dalias To your knowledge, how different is this from "Strict" tracking protection in Librewolf?
Also, I want to have the option to share data across domains, for example if a bank or something has spread a webapp across multiple domains for valid engineering reasons, I assume this can still be opted into?
@mcc There's no way to disable 1p-isolate on a per-site basis or anything. It's global.
I have not run into anything that seems to be broken by it. Normal SSO-type workflows nowadays know they have to pass data thru redirects and stuff rather than relying on being able to access cross-domain cookie state.
But if you're concerned, using a weaker tracking protection that can be turned off per-site might be a better choice for you. You cannot switch later without losing all your saved cookies (because of how the re-scoping works; actually I think the scoped ones are still there, but scoped in a way they'll never get used unless you switch 1p-isolate back to how it was set before).
Oct 14, 2026, 5:32 PM@dalias Well, the reason I'm asking is Librewolf has this big box for a "strict" mode, and opt-outs to a "strict" mode, and this is unique UI not in base firefox, and I know this corresponds to SOMETHING that is either an option in Base Firefox or actively on in Base Firefox but I'm still a little confused about what.
@mcc Then I'm confused, because upstream Firefox has a "Strict" setting for "Enhanced Tracking Protection" too. Sorry, I don't want to speculate more about details I don't know about.
Oct 14, 2026, 5:35 PM@dalias I think that's because it's confusing.